thermal: tsens8974: Add debug logs

Add debug logs to aid debugging and print code, sensor_num,
when temperature is read. Also print out offsets that are
computed for each sensor.

Change-Id: Id3d95eed29d4f5a7059aa66623f126546a7ba100
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>