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/board/broadcom/bcm968360bg/Kconfig b/board/broadcom/bcm968360bg/Kconfig
new file mode 100644
index 0000000..dd372f1
--- /dev/null
+++ b/board/broadcom/bcm968360bg/Kconfig
@@ -0,0 +1,17 @@
+if ARCH_BCM68360
+
+config SYS_VENDOR
+	default "broadcom"
+
+config SYS_BOARD
+	default "bcm968360bg"
+
+config SYS_CONFIG_NAME
+	default "broadcom_bcm968360bg"
+
+endif
+
+config TARGET_BCM968360BG
+	bool "Support Broadcom bcm968360bg"
+	depends on ARCH_BCM68360
+	select ARM64