V4L/DVB (4812): Detect presence of IR receiver/IR transmitter in tveeprom

Thanks to input from Steven Toth from Hauppauge the tveeprom module has
been extended to detect the presence of an IR transmitter (aka IR-blaster).

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>