msm: board-krypton: Add TSENS init

TSENS provides an interface to read the temperature.
Add early initialization to allow kernel thermal
driver to read the temperature at initialization.

Change-Id: Ifb2bb5fbd170c2fb1a10ff5209552093a231e930
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>