V4L/DVB (9007): S2API: Changed bandwidth to be expressed in HZ

Also added some compat code for the older API.

Added more ISDB message/command suggestions, current not connected in dvb-core.

Signed-off-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>