sound: Kconfig: drop unknown symbol ARCH_CLPS7500

Commit 635f0258 ("[ARM] clps7500: remove support") missed one instance
of the ARCH_CLPS7500 Kconfig symbol. Drop it now.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

sound/oss/Kconfig

@@ -521,7 +521,7 @@ config SC6600_CDROMBASE
 
 config SOUND_VIDC
 	tristate "VIDC 16-bit sound"
-	depends on ARM && (ARCH_ACORN || ARCH_CLPS7500)
+	depends on ARM && ARCH_ACORN
 	help
 	  16-bit support for the VIDC onboard sound hardware found on Acorn
 	  machines.