rpmsg: use module_rpmsg_driver in existing drivers and examples

Existing drivers and examples are updated to use the
module_rpmsg_driver helper macro.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
diff --git a/Documentation/rpmsg.txt b/Documentation/rpmsg.txt
index 1d88426..a95e36a 100644
--- a/Documentation/rpmsg.txt
+++ b/Documentation/rpmsg.txt
@@ -254,18 +254,7 @@
 	.callback	= rpmsg_sample_cb,
 	.remove		= rpmsg_sample_remove,
 };
-
-static int __init init(void)
-{
-	return register_rpmsg_driver(&rpmsg_sample_client);
-}
-module_init(init);
-
-static void __exit fini(void)
-{
-	unregister_rpmsg_driver(&rpmsg_sample_client);
-}
-module_exit(fini);
+module_rpmsg_driver(rpmsg_sample_client);
 
 Note: a similar sample which can be built and loaded can be found
 in samples/rpmsg/.