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/MAINTAINERS b/MAINTAINERS
index 6971905..89e3738 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -282,6 +282,7 @@
 F:	arch/arm/include/asm/arch-vf610/
 F:	arch/arm/include/asm/mach-imx/
 F:	board/freescale/*mx*/
+F:	board/freescale/common/
 F:	drivers/serial/serial_mxc.c
 
 ARM HISILICON