ALSA: sparc: amd7930: Fix module autoload for OF platform driver

This platform driver has a OF device ID table but the OF module
alias information is not created so module autoloading won't work.

Signed-off-by: Luis de Bethencourt <luis@debethencourt.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/sparc/amd7930.c

@@ -1064,6 +1064,7 @@ static const struct of_device_id amd7930_match[] = {
 	},
 	{},
 };
+MODULE_DEVICE_TABLE(of, amd7930_match);
 
 static struct platform_driver amd7930_sbus_driver = {
 	.driver = {