MAINTAINERS: Add some missing directories or files

In a few cases we have MAINTAINERS entries that are missing obvious
paths or files. Typically this means a board directory that did not list
itself, but in a few cases we have a Kconfig file or similar.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 89e3738..4a24a92 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -272,6 +272,7 @@
 R:	NXP i.MX U-Boot Team <uboot-imx@nxp.com>
 S:	Maintained
 T:	git https://source.denx.de/u-boot/custodians/u-boot-imx.git
+F:	arch/Kconfig.nxp
 F:	arch/arm/cpu/arm1136/mx*/
 F:	arch/arm/cpu/arm926ejs/mx*/
 F:	arch/arm/cpu/armv7/vf610/