bcm963158: add initial support

This add the initial support of the broadcom reference
board bcm963158 with a bcm63158 SoC.

This board has 1 GB of ram, 512 MB of flash (nand),
2 usb port, 1 uart, 4 ethernet ports (LAN), 1 ethernet port (WAN).

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/board/broadcom/bcm963158/Kconfig b/board/broadcom/bcm963158/Kconfig
new file mode 100644
index 0000000..41b6adb
--- /dev/null
+++ b/board/broadcom/bcm963158/Kconfig
@@ -0,0 +1,17 @@
+if ARCH_BCM63158
+
+config SYS_VENDOR
+	default "broadcom"
+
+config SYS_BOARD
+	default "bcm963158"
+
+config SYS_CONFIG_NAME
+	default "broadcom_bcm963158"
+
+endif
+
+config TARGET_BCM963158
+	bool "Support Broadcom bcm963158"
+	depends on ARCH_BCM63158
+	select ARM64