V4L/DVB (12349): cx88: HVR1300 ensure switching from Encoder to DVB-T and back is reliable

Current tip is broken and does not switch back to DVB-T correctly

Signed-off-by: Sohail Syyed <linuxtv@hubstar.net>
Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>