[media] DVB: Add basic API support for DVB-T2 and bump minor version

[steve@stevekerrison.com: Remove private definitions from cxd2820r that existed before API was defined]
Signed-off-by: Andreas Oberritter <obi@linuxtv.org>
Signed-off-by: Steve Kerrison <steve@stevekerrison.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>