[media] cx18: Bump driver version, since a new class of HVR-1600 is properly supported

Make a user visible driver version change, for the inevitable user support
questions about why newer model HVR-1600's do not work with (older
versions of) the cx18 driver.

Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>