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/bcm958300k/MAINTAINERS b/board/broadcom/bcm958300k/MAINTAINERS
new file mode 100644
index 0000000..f75ee6e
--- /dev/null
+++ b/board/broadcom/bcm958300k/MAINTAINERS
@@ -0,0 +1,6 @@
+Broadcom: Cygnus
+M:	Steve Rae <srae@broadcom.com>
+S:	Maintained
+F:	board/broadcom/bcm958300k/
+F:	include/configs/bcm_ep_board.h
+F:	configs/bcm958300k_defconfig