exfat: directly call filemap_write_and_wait_range() on < 5.19 kernel

sync_blockdev_range will be added to linux 5.19 kernel. So, do directly
call filemap_write_and_wait_range() instead of sync_blockdev_range() on
lower kernel version than 5.19 kernel.

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