ARM: imx: Select MIGHT_HAVE_CACHE_L2X0

Select MIGHT_HAVE_CACHE_L2X0 for armv6 and armv7 i.MX SoCs.

By selecting MIGHT_HAVE_CACHE_L2X0, the user still has the possibility to
disable CACHE_L2X0 selection via menuconfig.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/Kconfig

@@ -8,6 +8,7 @@ config ARCH_MXC
 	select GENERIC_ALLOCATOR
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_IRQ_CHIP
+	select MIGHT_HAVE_CACHE_L2X0 if ARCH_MULTI_V6_V7
 	select MULTI_IRQ_HANDLER
 	select SPARSE_IRQ
 	select USE_OF