NFS: Alias the nfs module to nfs4

commit 425e776d upstream.

This allows distros to remove the line from their modprobe
configuration.
Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

fs/nfs/super.c

@@ -3087,4 +3087,6 @@ static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
 	return res;
 }
 
+MODULE_ALIAS("nfs4");
+
 #endif /* CONFIG_NFS_V4 */