acquire spi lock in the opus tag parser

src/database/file_gatherer.cpp

@@ -70,6 +70,7 @@ auto FileGathererImpl::FindFiles(
       }
     }
 
+    auto lock = drivers::acquire_spi();
     f_closedir(&dir);
     to_explore.pop_front();
   }

src/database/tag_parser.cpp

@@ -256,6 +256,7 @@ auto GenericTagParser::ReadAndParseTags(const std::pmr::string& path)
 
 auto OpusTagParser::ReadAndParseTags(const std::pmr::string& path)
     -> std::shared_ptr<TrackTags> {
+  auto lock = drivers::acquire_spi();
   std::pmr::string vfs_path = "/sdcard" + path;
   int err;
   OggOpusFile* f = op_test_file(vfs_path.c_str(), &err);