thermal: tsens: Fix invalid set temperature check

When setting a temperature value of 0 there is an error
because of an invalid check. Remove this check.

Change-Id: Iefb348aad5e2ebe8a3c6e9b39a25cb6f284abf6d
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>