V4L/DVB (11363): tvp5150: remove i2c legacy code.

All drivers that use tvp5150 now use v4l2_subdev, so we can remove the
legacy code from tvp5150.

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