ALSA: gusextreme: Fix build errors

gusextreme depends on opl3 support. Add the approriate select to Kconfig.
Also remove the unnecessary hwdep select.

Relevant build errors:
ERROR: "snd_opl3_hwdep_new" [sound/isa/gus/snd-gusextreme.ko] undefined!
ERROR: "snd_opl3_create" [sound/isa/gus/snd-gusextreme.ko] undefined!
Signed-off-by: Ville Syrjala <syrjala@sci.fi>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/Kconfig

@@ -211,7 +211,7 @@ config SND_GUSCLASSIC
 
 config SND_GUSEXTREME
 	tristate "Gravis UltraSound Extreme"
-	select SND_HWDEP
+	select SND_OPL3_LIB
 	select SND_MPU401_UART
 	select SND_PCM
 	help