V4L/DVB (4206): Cx88-blackbird: always set encoder height based on tvnorm->id

Removed the switch..case block in blackbird_probe for setting encoder height
based on video standard. All blackbird devices can rely on tvnorm->id to
retrieve this information from the cx2388x video decoder - tuner_formats
should not be used to determine the encoding video standard.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>