[media] MAINTAINERS: IT913X driver filenames

I removed tuner_ prefix from the driver file names. Update
maintainers entry according to that.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

MAINTAINERS

@@ -5066,7 +5066,7 @@ W:	http://palosaari.fi/linux/
 Q:	http://patchwork.linuxtv.org/project/linux-media/list/
 T:	git git://linuxtv.org/anttip/media_tree.git
 S:	Maintained
-F:	drivers/media/tuners/tuner_it913x*
+F:	drivers/media/tuners/it913x*
 
 IVTV VIDEO4LINUX DRIVER
 M:	Andy Walls <awalls@md.metrocast.net>