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/toradex/apalis-imx8/MAINTAINERS b/board/toradex/apalis-imx8/MAINTAINERS
index 03b0fda..198399c 100644
--- a/board/toradex/apalis-imx8/MAINTAINERS
+++ b/board/toradex/apalis-imx8/MAINTAINERS
@@ -5,6 +5,7 @@
 F:	arch/arm/dts/fsl-imx8qm-apalis.dts
 F:	arch/arm/dts/fsl-imx8qm-apalis-u-boot.dtsi
 F:	board/toradex/apalis-imx8/
+F:	board/toradex/common/
 F:	configs/apalis-imx8_defconfig
 F:	doc/board/toradex/apalis-imx8.rst
 F:	include/configs/apalis-imx8.h