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 <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>

Documentation/rpmsg.txt

···
 	.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/.

samples/rpmsg/rpmsg_client_sample.c

···
 	.callback	= rpmsg_sample_cb,
 	.remove		= rpmsg_sample_remove,
 };
-
-static int __init rpmsg_client_sample_init(void)
-{
-	return register_rpmsg_driver(&rpmsg_sample_client);
-}
-module_init(rpmsg_client_sample_init);
-
-static void __exit rpmsg_client_sample_fini(void)
-{
-	unregister_rpmsg_driver(&rpmsg_sample_client);
-}
-module_exit(rpmsg_client_sample_fini);
+module_rpmsg_driver(rpmsg_sample_client);
 
 MODULE_DESCRIPTION("Remote processor messaging sample client driver");
 MODULE_LICENSE("GPL v2");