[media] az6007: convert it to use dvb-usb-v2

Change it to use dvb-usb-v2. The driver should be working as before.
The only functional changes should be at the driver debug logs.

This driver needs the cypress firmware load, so, auto-selects it.

Acked-by: Antti Palosaari <crope@iki.fi>
Reviewed-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>