[media] dvb_frontend: Handle all possible DVBv3 values for bandwidth

Due to DVB-T2, several new possible values for bandwidth were added.
As the DVBv3 struct were updated to handle them, the core needs to
handle all of them, as a DVBv3 application might try to use it.

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