thermal: msm8960_tsens: Fix reading the correct sensor4 address

Fix reading from the correct QFPROM sensor4 address for offset
value to calculate calibration.

Change-Id: I6b044a078b3b8f88802367044d773534ae679e05
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>