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/board/terasic/de10-nano/MAINTAINERS b/board/terasic/de10-nano/MAINTAINERS
index f4dd0df..ebfd3b2 100644
--- a/board/terasic/de10-nano/MAINTAINERS
+++ b/board/terasic/de10-nano/MAINTAINERS
@@ -1,5 +1,6 @@
 DE10-NANO BOARD
 M:	Dalon Westergreen <dwesterg@gmail.com>
 S:	Maintained
+F:	board/terasic/de10-nano/
 F:	include/configs/socfpga_de10_nano.h
 F:	configs/socfpga_de10_nano_defconfig