sunrpc: add MODULE_ALIAS to match the filesystem name

sunrpc implements the rpc_pipefs filesystem type.
Add the alias to have the module requested automatically by the kernel
when the filesystem is mounted.
Signed-off-by: NMichal Schmidt <mschmidt@redhat.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

net/sunrpc/rpc_pipe.c

@@ -1084,3 +1084,6 @@ void unregister_rpc_pipefs(void)
 	kmem_cache_destroy(rpc_inode_cachep);
 	unregister_filesystem(&rpc_pipe_fs_type);
 }
+
+/* Make 'mount -t rpc_pipefs ...' autoload this module. */
+MODULE_ALIAS("rpc_pipefs");