MAINTAINERS: Deal with '+' in paths

The listed paths are allowed to contain wildcards.  This includes the
'+' character which we have as a literal part of the path in a few
cases. Escape the '+' here so that files are matched.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/l+g/vinco/MAINTAINERS b/board/l+g/vinco/MAINTAINERS
index 0cd6044..14b76b1 100644
--- a/board/l+g/vinco/MAINTAINERS
+++ b/board/l+g/vinco/MAINTAINERS
@@ -1,6 +1,6 @@
 VInCo Platform
 M:	Gregory CLEMENT <gregory.clement@free-electrons.com>
 S:	Maintained
-F:	board/l+g/vinco
+F:	board/l\+g/vinco/
 F:	include/configs/vinco.h
 F:	configs/vinco_defconfig