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/LaCie/net2big_v2/MAINTAINERS b/board/LaCie/net2big_v2/MAINTAINERS
index 7046e1b..66e8219 100644
--- a/board/LaCie/net2big_v2/MAINTAINERS
+++ b/board/LaCie/net2big_v2/MAINTAINERS
@@ -7,6 +7,7 @@
 F:	arch/arm/dts/kirkwood-net2big.dts
 F:	arch/arm/dts/kirkwood-net2big-u-boot.dtsi
 F:	arch/arm/dts/kirkwood-netxbig.dtsi
+F:	board/LaCie/common/
 F:	board/LaCie/net2big_v2/
 F:	include/configs/lacie_kw.h
 F:	configs/d2net_v2_defconfig