MAINTAINERS: remove unused radeon drm pattern

Commit 8dcedd7e87f4 ("UAPI: (Scripted) Disintegrate include/drm") moved
the file, remove the pattern.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -3039,7 +3039,6 @@ L:	dri-devel@lists.freedesktop.org
 T:	git git://people.freedesktop.org/~agd5f/linux
 S:	Supported
 F:	drivers/gpu/drm/radeon/
-F:	include/drm/radeon*
 F:	include/uapi/drm/radeon*
 
 DRM PANEL DRIVERS