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/bcm958712k/MAINTAINERS b/board/broadcom/bcm958712k/MAINTAINERS
new file mode 100644
index 0000000..024fb14
--- /dev/null
+++ b/board/broadcom/bcm958712k/MAINTAINERS
@@ -0,0 +1,6 @@
+BCM958712K BOARD
+M:	Jon Mason <jon.mason@broadcom.com>
+S:	Maintained
+F:	board/broadcom/bcmns2/
+F:	include/configs/bcm_northstar2.h
+F:	configs/bcm958712k_defconfig