exfat: release 5.10.1 version

Major changes are:
 - Don't clear MediaFailure and VolumeDirty bit in volume flags
   if these were already set before mounting.
 - Fix use of uninitialized spinlock on error path.
 - Fix missing err assignment in exfat_build_inode().
 - cleanup codes and remove unneeded codes.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>