V4L/DVB: [nGene] Trivial I2C related fixes/cleanups

Trivial I2C related fixes/cleanups
 - Remove Unused I2C ID
 - point the I2C device to the physical device

Signed-off-by: Manu Abraham <manu@linuxtv.org>
Acked-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>