ARM: u300: only build for ARCH_MULTI_V5

This avoids impossible platform combinations, as we cannot
build a combined V5 + V6/V7 kernel.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/mach-u300/Kconfig

@@ -3,7 +3,7 @@ menu "ST-Ericsson AB U300/U335 Platform"
 comment "ST-Ericsson Mobile Platform Products"
 
 config ARCH_U300
-	bool "ST-Ericsson U300 Series"
+	bool "ST-Ericsson U300 Series" if ARCH_MULTI_V5
 	depends on MMU
 	select ARCH_REQUIRE_GPIOLIB
 	select ARM_AMBA