[media] usbtv: fix dependency

This fixes a dependency problem as found by Randy Dunlap:
https://lkml.org/lkml/2013/6/27/501Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/usbtv/Kconfig

 config VIDEO_USBTV
         tristate "USBTV007 video capture support"
-        depends on VIDEO_DEV
+        depends on VIDEO_V4L2
         select VIDEOBUF2_VMALLOC
 
         ---help---