fs: rename "rename2" i_op to "rename"

Generated patch:

sed -i "s/\.rename2\t/\.rename\t\t/" `git grep -wl rename2`
sed -i "s/\brename2\b/rename/g" `git grep -wl rename2`

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

kernel/bpf/inode.c

@@ -189,7 +189,7 @@ static const struct inode_operations bpf_dir_iops = {
 	.mknod		= bpf_mkobj,
 	.mkdir		= bpf_mkdir,
 	.rmdir		= simple_rmdir,
-	.rename2	= simple_rename,
+	.rename		= simple_rename,
 	.link		= simple_link,
 	.unlink		= simple_unlink,
 };