thermal: tsens: Enable reading temperature sensor

Add calibration fusemap to obtain the slope and
offsets. The calibration data is applied over the
temperature code before returning the final result
of the temperature to the user. Add support to
differentiate the changes in the registers for krypton.
These are added to support additional sensors over
the existing ones. In conjunction remove using strings to
determine which fusemap to use.

Change-Id: I33e69168948d1b5e95ae5b73ef73b60b32c7b3fb
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>