V4L/DVB (11849): ivtv: Probe more I2C addresses for IR devices

Probe I2C addresses 0x71 and 0x6b for IR receiver devices (for the
PVR150 and Adaptec cards, respectively.)

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>