[media] cx231xx: Add support for PV Xcapture USB

Adds support for Pixelviex Xcapture USB grabber device.
This device has one composite and one s-video entry
only, plus a button.

For now, the button is not supported.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2 files changed