arm: bcmbca: add bcm6813 SoC support

BCM6813 is a Broadcom B53 based PON and WLAN AP router 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.

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

Signed-off-by: William Zhang <william.zhang@broadcom.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
diff --git a/arch/arm/mach-bcmbca/Kconfig b/arch/arm/mach-bcmbca/Kconfig
index acdb6de..a7a3b4b 100644
--- a/arch/arm/mach-bcmbca/Kconfig
+++ b/arch/arm/mach-bcmbca/Kconfig
@@ -55,6 +55,13 @@
 	select DM_SERIAL
 	select PL01X_SERIAL
 
+config BCM6813
+	bool "Support for Broadcom 6813 Family"
+	select ARM64
+	select SYS_ARCH_TIMER
+	select DM_SERIAL
+	select PL01X_SERIAL
+
 config BCM6846
 	bool "Support for Broadcom 6846 Family"
 	select SYS_ARCH_TIMER
@@ -76,6 +83,7 @@
 source "arch/arm/mach-bcmbca/bcm63148/Kconfig"
 source "arch/arm/mach-bcmbca/bcm63178/Kconfig"
 source "arch/arm/mach-bcmbca/bcm6756/Kconfig"
+source "arch/arm/mach-bcmbca/bcm6813/Kconfig"
 source "arch/arm/mach-bcmbca/bcm6846/Kconfig"
 source "arch/arm/mach-bcmbca/bcm6878/Kconfig"