Merge branch 'bugfix/vfs_ut_performance' into 'master'

VFS: move all functions into RAM which are called in the performance test

See merge request idf/esp-idf!4047

components/vfs/test/linker.lf

@@ -4,3 +4,6 @@ entries:
     vfs:esp_vfs_open (noflash)
     vfs:esp_vfs_write (noflash)
     vfs:esp_vfs_close (noflash)
+    vfs:get_vfs_for_fd (noflash)
+    vfs:get_vfs_for_path (noflash)
+    vfs:translate_path (noflash)