board: ns2: Add support for Broadcom Northstar 2

Add support for the Broadcom Northstar2 SoC and SVK (bcm958712k).  The
BCM5871X is a series of quad-core 64-bit 2GHz ARMv8 Cortex-A57
processors targeting a broad range of networking applications.

Signed-off-by: Jon Mason <jon.mason@broadcom.com>
diff --git a/board/broadcom/bcmns2/Kconfig b/board/broadcom/bcmns2/Kconfig
new file mode 100644
index 0000000..3ac6724
--- /dev/null
+++ b/board/broadcom/bcmns2/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_BCMNS2
+
+config SYS_BOARD
+	default "bcmns2"
+
+config SYS_VENDOR
+	default "broadcom"
+
+config SYS_SOC
+	default "ns2"
+
+config SYS_CONFIG_NAME
+	default "bcm_northstar2"
+
+endif