MAINTAINERS: Update the files list for the Rockchip DRM driver

The location listed is a folder - swap the wildcard with '/'

Cc: Mark Yao <mark.yao@rock-chips.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1461279842-28695-6-git-send-email-emil.l.velikov@gmail.com

MAINTAINERS

@@ -3887,7 +3887,7 @@ M:	Mark Yao <mark.yao@rock-chips.com>
 L:	dri-devel@lists.freedesktop.org
 S:	Maintained
 F:	drivers/gpu/drm/rockchip/
-F:	Documentation/devicetree/bindings/display/rockchip*
+F:	Documentation/devicetree/bindings/display/rockchip/
 
 DRM DRIVERS FOR STI
 M:	Benjamin Gaignard <benjamin.gaignard@linaro.org>