ANDROID: Incremental fs: fix setxattr callbacks due to upstream changes

In commit 0c5fd887 ("acl: move idmapped mount fixup into
vfs_{g,s}etxattr()") the signature of setxattr has changed, so fixup
incfs so that it continues to build properly.

Someday this will be merged upstream and this type of maintenance will
happen automagically...

Fixes: 0c5fd887 ("acl: move idmapped mount fixup into vfs_{g,s}etxattr()")
Cc: Paul Lawrence <paullawrence@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I78e4af3fb999cf0ffc1128ccc15d6af6a3b1f591