[media] V4L menu: remove duplicate USB dependency

Thanks to Guennadi Liakhovetski <g.liakhovetski@gmx.de> for pointing this
out to me.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/Kconfig

@@ -589,7 +589,7 @@ menuconfig V4L_USB_DRIVERS
 	depends on USB
 	default y
 
-if V4L_USB_DRIVERS && USB
+if V4L_USB_DRIVERS
 
 source "drivers/media/video/uvc/Kconfig"