ARM: oxnas: remove redundant select CPU_V6K

MACH_OX820 depends on ARCH_MULTI_V6, which already selects CPU_V6K.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>

arch/arm/mach-oxnas/Kconfig

@@ -28,7 +28,6 @@ config MACH_OX820
 	depends on ARCH_MULTI_V6
 	select ARM_GIC
 	select DMA_CACHE_RWFO if SMP
-	select CPU_V6K
 	select HAVE_SMP
 	select HAVE_ARM_SCU if SMP
 	select HAVE_ARM_TWD if SMP