arm: bcmbca: add bcm63178 SoC support

BCM63178 is an ARM A7 based DSL Broadband SoC. It is part of the BCA
(Broadband Carrier Access origin) chipset family so it's added under
ARCH_BCMBCA platform. This initial support includes a bare-bone
implementation and dts with CPU subsystem, memory and ARM PL011 uart.

This SoC is supported in the linux-next git repository so the dts and
dtsi files are copied from linux with minor fix-up that needs to be
upstreamed to linux as well.

The u-boot image can be loaded from flash or network to the entry
point address in the memory and boot from there.

Signed-off-by: William Zhang <william.zhang@broadcom.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 048db37..b73f2d0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -216,8 +216,9 @@
 S:	Maintained
 F:	arch/arm/mach-bcmbca/
 F:	board/broadcom/bcmbca/
-F:	configs/bcm947622_defconfig
-F:	include/configs/bcm947622.h
+N:	bcmbca
+N:	bcm[9]?47622
+N:	bcm[9]?63178
 
 ARM BROADCOM BCMSTB
 M:	Thomas Fitzsimmons <fitzsim@fitzsim.org>