MAINTAINERS: Add a number of "common" directories

A number of platforms have "common" directories that are in turn not
listed by the board MAINTAINERS file.  Add these directories in many
cases.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/keymile/secu1/MAINTAINERS b/board/keymile/secu1/MAINTAINERS
index 833b3fd..8df25f8 100644
--- a/board/keymile/secu1/MAINTAINERS
+++ b/board/keymile/secu1/MAINTAINERS
@@ -1,5 +1,7 @@
 Hitachi Power Grids SECU1 BOARD
 M:	Holger Brunck <holger.brunck@hitachienergy.com>
 S:	Maintained
+F:	board/keymile/common/
+F:	board/keymile/scripts/
 F:	include/configs/socfpga_arria5_secu1.h
 F:	configs/socfpga_secu1_defconfig