MAINTAINERS: Add file pattern for fb dt bindings.

Now that Documentation/devicetree/bindings/fb/ exists, make sure it's
also matched by the default framebuffer entry.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 5b28ed0..d71a5c8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2633,6 +2633,7 @@
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/lethal/fbdev-2.6.git
 S:	Orphan
 F:	Documentation/fb/
+F:	Documentation/devicetree/bindings/fb/
 F:	drivers/video/
 F:	include/video/
 F:	include/linux/fb.h