BACKPORT: exfat: do not fallback to buffered write

After commit(11a347fb exfat: change to get file size from
DataLength), the remaining area or hole had been filled with
zeros before calling exfat_direct_IO(), so there is no need to
fallback to buffered write, and ->i_size_aligned is no longer
needed, drop it.

Change-Id: Ibf2a6d3df7c82e76928b3fe356fbf5f831a52148
Signed-off-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
(cherry picked from commit 231eb762)
[minor conflict in fs/exfat/inode.c]
Bug: 397325648
Signed-off-by: Daniel Rosenberg <drosen@google.com>
Signed-off-by: Lee Jones <joneslee@google.com>