ALSA: cmi8330: add OPL3 support

Add OPL3 handling to the driver
and volume control for FM synthesis.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/isa/Kconfig b/sound/isa/Kconfig
index ce0aa04..be2d377 100644
--- a/sound/isa/Kconfig
+++ b/sound/isa/Kconfig
@@ -94,6 +94,7 @@
 	tristate "C-Media CMI8330"
 	select SND_WSS_LIB
 	select SND_SB16_DSP
+	select SND_OPL3_LIB
 	help
 	  Say Y here to include support for soundcards based on the
 	  C-Media CMI8330 chip.