V4L/DVB: af9015: MYGICTV U718 remote autodetection

Autodetect MYGICTV U718 from eeprom hash and select remote automatically.
Remove old iManufacturer string compare based remote selection logic.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>