bcm968360bg: add initial support

This add the initial support of the broadcom reference
board bcm968360bg with a bcm68360 SoC.

This board has 512 MB of RAM, 256 MB of flash (nand),
2 USB port, 1 UART, and 4 ethernet ports.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 38d0c2a..b48b05f 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -859,6 +859,9 @@
 dtb-$(CONFIG_ARCH_BCM63158) += \
 	bcm963158.dtb
 
+dtb-$(CONFIG_ARCH_BCM68360) += \
+	bcm968360bg.dtb
+
 dtb-$(CONFIG_ARCH_BCM6858) += \
 	bcm968580xref.dtb