MAINTAINERS: Fix path typos and similar

We have a number of cases where the in-tree path of files and where
they presumably were when the first version of a patch were posted
differ slightly.  Correct these to point at where the files are now.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/google/chromebox_panther/MAINTAINERS b/board/google/chromebox_panther/MAINTAINERS
index c88774b..4963a89 100644
--- a/board/google/chromebox_panther/MAINTAINERS
+++ b/board/google/chromebox_panther/MAINTAINERS
@@ -1,6 +1,6 @@
 CHROMEBOX PANTHER BOARD
 M:	Simon Glass <sjg@chromium.org>
 S:	Maintained
-F:	board/google/chromebook_panther/
+F:	board/google/chromebox_panther/
 F:	include/configs/chromebox_panther.h
 F:	configs/chromebox_panther_defconfig