[media] lirc_zilog: Remove use of deprecated struct i2c_adapter.id field

Remove use of deprecated struct i2c_adapter.id field.  In the process,
perform different detection of the HD PVR's Z8 IR microcontroller versus
the other Hauppauge cards with the Z8 IR microcontroller.

Also added a comment about probe() function behavior that needs to be
fixed.

Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>