remove unused ISR allocation

this was blocking the i2s driver somehow!(?)

src/audio/i2s_audio_output.cpp

@@ -92,12 +92,10 @@ auto I2SAudioOutput::ProcessStreamInfo(const StreamInfo& info)
 
 auto I2SAudioOutput::ProcessChunk(const cpp::span<std::byte>& chunk)
     -> cpp::result<std::size_t, AudioProcessingError> {
-  ESP_LOGI(kTag, "playing samples");
   SetSoftMute(false);
   // TODO(jacqueline): write smaller parts with a small delay so that we can
   // be responsive to pause and seek commands.
-  std::size_t bytes_written = dac_->WriteData(chunk, portMAX_DELAY);
+  dac_->WriteData(chunk, portMAX_DELAY);
-  ESP_LOGI(kTag, "played %u bytes", bytes_written);
   return 0;
 }
 

src/drivers/display.cpp

@@ -241,7 +241,7 @@ void Display::Flush(lv_disp_drv_t* disp_drv,
   // lv_disp_flush_ready(&driver_);
 }
 
-void IRAM_ATTR Display::PostTransaction(const spi_transaction_t& transaction) {
+void Display::PostTransaction(const spi_transaction_t& transaction) {
   if (reinterpret_cast<uintptr_t>(transaction.user) & LVGL_FLUSH) {
     lv_disp_flush_ready(&driver_);
   }

src/main/main.cpp

@@ -89,7 +89,6 @@ void lvgl_main(void* voidArgs) {
 extern "C" void app_main(void) {
   ESP_LOGI(TAG, "Initialising peripherals");
 
-  ESP_ERROR_CHECK(gpio_install_isr_service(ESP_INTR_FLAG_LOWMED));
   ESP_ERROR_CHECK(drivers::init_i2c());
   ESP_ERROR_CHECK(drivers::init_spi());