powerpc: Minor cleanup to sound/ppc/Kconfig

We can replace PPC32 || PPC64 as a dependancy with just PPC as all
powerpc platforms (32-bit and 64-bit) define PPC now.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

sound/ppc/Kconfig

@@ -2,7 +2,7 @@
 
 menuconfig SND_PPC
 	bool "PowerPC sound devices"
-	depends on PPC64 || PPC32
+	depends on PPC
 	default y
 	help
 	  Support for sound devices specific to PowerPC architectures.