ARM: multi_v7_defconfig: enable CONFIG_ARCH_BCMBCA in armv7 defconfig

Enable CONFIG_ARCH_BCMBCA in multi_v7_defconfig. This config can be
used to build a basic kernel for BCM47622 booting to console.
Signed-off-by: William Zhang <william.zhang@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/configs/multi_v7_defconfig

@@ -29,6 +29,7 @@ CONFIG_ARCH_BCM2835=y
 CONFIG_ARCH_BCM_53573=y
 CONFIG_ARCH_BCM_63XX=y
 CONFIG_ARCH_BRCMSTB=y
+CONFIG_ARCH_BCMBCA=y
 CONFIG_ARCH_BERLIN=y
 CONFIG_MACH_BERLIN_BG2=y
 CONFIG_MACH_BERLIN_BG2CD=y