Update LVGL to v9.1.0

lib/lvgl/docs/overview/renderers/arm-2d.md

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-# ARM-2D GPU
-
-TODO
-

lib/lvgl/docs/overview/renderers/arm2d.rst

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+==========
+Arm-2D GPU
+==========
+
+Arm-2D is not a GPU but **an abstraction layer for 2D GPUs dedicated to
+Microcontrollers**. It supports all Cortex-M processors ranging from
+Cortex-M0 to the latest Cortex-M85.
+
+Arm-2D accelerates LVGL9 with two modes: **Synchronous Mode** and
+**Asynchronous Mode**. 
+- When **Helium** and **ACI (Arm Custom Instruction)** are available, it is recommend
+  to use **Synchronous Mode** to accelerate LVGL. 
+- When Arm-2D backed 2D-GPUs are available, for example, **DMAC-350 based 2D
+  GPUs**, it is recommend to use **Asynchronous Mode** to accelerate LVGL.
+
+Arm-2D is an open-source project on Github. For more, please refer to:
+https://github.com/ARM-software/Arm-2D.
+
+How to Use
+**********
+
+In general:
+- you can set the macro :c:macro:`LV_USE_DRAW_ARM2D_SYNC` to ``1`` in
+  ``lv_conf.h`` to enable Arm-2D synchronous acceleration for LVGL. 
+- You can set 
+  the macro :c:macro:`LV_USE_DRAW_ARM2D_ASYNC` to ``1`` in ``lv_conf.h`` to enable 
+  Arm-2D Asynchronous acceleration for LVGL. 
+
+If you are using
+`CMSIS-Pack <https://github.com/lvgl/lvgl/tree/master/env_support/cmsis-pack>`__
+to deploy the LVGL. You don't have to define the macro
+:c:macro:`LV_USE_DRAW_ARM2D_SYNC` manually, instead the lv_conf_cmsis.h will
+check the environment and set the :c:macro:`LV_USE_DRAW_ARM2D_SYNC` accordingly.
+
+Design Considerations
+*********************
+
+As mentioned before, Arm-2D is an abstraction layer for 2D GPU; hence if
+there is no accelerator or dedicated instruction set (such as Helium or
+ACI) available for Arm-2D, it provides negligible performance boost for
+LVGL (sometimes worse) for regular Cortex-M processors.
+
+**We highly recommend you enable Arm-2D acceleration for LVGL** when:
+
+-  The target processors are **Cortex-M55**, **Cortex-M52** and **Cortex-M85**
+-  The target processors support
+   `Helium <https://developer.arm.com/documentation/102102/0103/?lang=en>`__.
+-  The device vendor provides an arm-2d compliant driver for their
+   propriotory 2D accelerators and/or ACI(Arm Customized Instruction).
+-  The target device contains
+   `DMAC-350 <https://community.arm.com/arm-community-blogs/b/internet-of-things-blog/posts/arm-corelink-dma-350-next-generation-direct-memory-access-for-endpoint-ai>`__
+
+Examples
+********
+
+-  `A Cortex-M55 (supports Helium) based MDK Project, PC emulation is
+   available. <https://github.com/lvgl/lv_port_an547_cm55_sim>`__
+
+API
+***
+
+:ref:`lv_gpu_arm2d`

lib/lvgl/docs/overview/renderers/dma2d.md

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-# DMA2D GPU
-
-TODO
-

lib/lvgl/docs/overview/renderers/index.md

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-
-# Renderers and GPUs
-
-
-```eval_rst
-
-.. toctree::
-   :maxdepth: 2
-
-   sw
-   sdl
-   arm-2d
-   pxp-vglite
-   dma2d
-```
-

lib/lvgl/docs/overview/renderers/index.rst

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+==================
+Renderers and GPUs
+==================
+
+.. toctree::
+    :maxdepth: 2
+
+    sw
+    sdl
+    arm2d
+    pxp
+    stm32_dma2d
+    vglite

lib/lvgl/docs/overview/renderers/pxp-vglite.md

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-# NXP PXP and VGLite GPU
-
-TODO
-

lib/lvgl/docs/overview/renderers/pxp.rst

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+===========
+NXP PXP GPU
+===========
+
+API
+---
+
+:ref:`lv_draw_pxp`
+
+:ref:`lv_draw_pxp_blend`
+
+:ref:`lv_gpu_nxp_pxp`
+
+:ref:`lv_gpu_nxp_pxp_osa`

lib/lvgl/docs/overview/renderers/sdl.md

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-# SDL renderer
-
-TODO
-

lib/lvgl/docs/overview/renderers/sdl.rst

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+============
+SDL renderer
+============
+
+API
+---
+
+:ref:`lv_draw_sdl`
+
+:ref:`lv_draw_sdl_composite`
+
+:ref:`lv_draw_sdl_img`
+
+:ref:`lv_draw_sdl_layer`
+
+:ref:`lv_draw_sdl_mask`
+
+:ref:`lv_draw_sdl_priv`
+
+:ref:`lv_draw_sdl_rect`
+
+:ref:`lv_draw_sdl_stack_blur`
+
+:ref:`lv_draw_sdl_texture_cache`
+
+:ref:`lv_draw_sdl_utils`

lib/lvgl/docs/overview/renderers/stm32_dma2d.rst

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+=========
+DMA2D GPU
+=========
+
+API
+---
+
+:ref:`lv_gpu_stm32_dma2d`

lib/lvgl/docs/overview/renderers/sw.md

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-# Software renderer
-
-TODO
-

lib/lvgl/docs/overview/renderers/sw.rst

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+=================
+Software renderer
+=================
+
+API
+---
+
+:ref:`lv_draw_sw`
+
+:ref:`lv_draw_sw_blend`
+
+:ref:`lv_draw_sw_dither`
+
+:ref:`lv_draw_sw_gradient`

lib/lvgl/docs/overview/renderers/vglite.rst

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+==============
+NXP VGLite GPU
+==============
+
+API
+---
+
+:ref:`lv_draw_vglite`
+
+:ref:`lv_draw_vglite_arc`
+
+:ref:`lv_draw_vglite_blend`
+
+:ref:`lv_draw_vglite_line`
+
+:ref:`lv_draw_vglite_rect`
+