ALSA: Add vmaster controls for Pmac 5500, iMac G3 SL, and PBook G3 Lombard

Add virtual master controls for PowerMac 5500 (AWACS) and iMac G3 Slot-loading
and PowerBook G3 Lombard (Screamer).

Signed-off-by: Risto Suominen <Risto.Suominen@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/ppc/Kconfig b/sound/ppc/Kconfig
index 777de2b..bd2338a 100644
--- a/sound/ppc/Kconfig
+++ b/sound/ppc/Kconfig
@@ -13,6 +13,7 @@
 	tristate "PowerMac (AWACS, DACA, Burgundy, Tumbler, Keywest)"
 	depends on I2C && INPUT && PPC_PMAC
 	select SND_PCM
+	select SND_VMASTER
 	help
 	  Say Y here to include support for the integrated sound device.