arm: convert Cygnus and NSP boards to Kconfig

Convert the bcm958300k and the bcm958622hr boards from "boards.cfg" to Kconfig.

Signed-off-by: Steve Rae <srae@broadcom.com>
diff --git a/board/broadcom/bcm958622hr/MAINTAINERS b/board/broadcom/bcm958622hr/MAINTAINERS
new file mode 100644
index 0000000..c34272f
--- /dev/null
+++ b/board/broadcom/bcm958622hr/MAINTAINERS
@@ -0,0 +1,6 @@
+Broadcom: Northstar Plus
+M:	Steve Rae <srae@broadcom.com>
+S:	Maintained
+F:	board/broadcom/bcm958622hr/
+F:	include/configs/bcm_ep_board.h
+F:	configs/bcm958622hr_defconfig