attr: adjust acl_max of f2fs if inline_xattr is set

attr: adjust acl_max of f2fs if inline_xattr is set

If f2fs gets inline_xattr, it enlarges the whole xattr space, which also enables
to cover more acl entries up to 531 from 506.
This patch detects the mount option, inline_xattr, and changes the result of
_acl_get_max for generic/026.

Fixes: 9f7bf79d0c34 ("attr: add maximum acl count for f2fs")
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>