ubifs: Remove unused header

UBIFS does not support POSIX ACLs, so there is no need for including any
POSIX ACL hesders.
Signed-off-by: NAndreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: NRichard Weinberger <richard@nod.at>

fs/ubifs/xattr.c

@@ -59,7 +59,6 @@
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <linux/xattr.h>
-#include <linux/posix_acl_xattr.h>
 
 /*
  * Limit the number of extended attributes per inode so that the total size