thermal: tsens: Enable TSENS controller health monitor

Temperature sensor (TSENS) driver health monitor periodically
sets a very low temperature threshold on the critical trip zone
and polls to check if the trip is set. This is done on a deferred
workqueue and helps provide indication on the health of the
TSENS controller.

Change-Id: I4b16db429fead5c731dec289f0360682c92775b8
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>