FROMGIT: ext4: Add EXT4_IOC_FSGETXATTR/EXT4_IOC_FSSETXATTR to compat_ioctl.

These are backed by 'struct fsxattr' which has the same size on all
architectures.

Signed-off-by: Martijn Coenen <maco@android.com>
Link: https://lore.kernel.org/patchwork/patch/1172430/


Signed-off-by: Martijn Coenen <maco@google.com>
(cherry picked from commit a54d8d34d2354f3a2a9dda00d9dd6666a50c486b git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev)
Change-Id: Ie7a047b94415ef7c19fa534f47741ebd79dcc909