ALSA: Convert mips directory to module_platform_driver

Factor out some boilerplate code.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/mips/hal2.c b/sound/mips/hal2.c
index 2e6c858..5f88d1f 100644
--- a/sound/mips/hal2.c
+++ b/sound/mips/hal2.c
@@ -935,15 +935,4 @@
 	}
 };
 
-static int __init alsa_card_hal2_init(void)
-{
-	return platform_driver_register(&hal2_driver);
-}
-
-static void __exit alsa_card_hal2_exit(void)
-{
-	platform_driver_unregister(&hal2_driver);
-}
-
-module_init(alsa_card_hal2_init);
-module_exit(alsa_card_hal2_exit);
+module_platform_driver(hal2_driver);