ARM: multi_v7_defconfig: Update configs for BCM63138

Remove CONFIG_ARCH_BCM_63XX and add BCMBCA sub platform configs.
Signed-off-by: William Zhang <william.zhang@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/configs/multi_v7_defconfig

@@ -28,9 +28,11 @@ CONFIG_ARCH_BCM_21664=y
 CONFIG_ARCH_BCM_23550=y
 CONFIG_ARCH_BCM2835=y
 CONFIG_ARCH_BCM_53573=y
-CONFIG_ARCH_BCM_63XX=y
 CONFIG_ARCH_BRCMSTB=y
 CONFIG_ARCH_BCMBCA=y
+CONFIG_ARCH_BCMBCA_CORTEXA7=y
+CONFIG_ARCH_BCMBCA_CORTEXA9=y
+CONFIG_ARCH_BCMBCA_BRAHMAB15=y
 CONFIG_ARCH_BERLIN=y
 CONFIG_MACH_BERLIN_BG2=y
 CONFIG_MACH_BERLIN_BG2CD=y