media: uvcvideo: Use intf instead of udev for printks

The UVC driver is a usb_interface driver. Use the correct device for
printks to avoid confusions with other interface drivers associated to
the same usb device.

With this change:
uvcvideo 3-6:1.0: Found UVC 1.10 device USB2.0 WebCam (1234:abcd)

Without this change:
usb 3-6: Found UVC 1.10 device USB2.0 WebCam (1234:abcd)

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>