thermal: msm_tsens: Fix notify to userspace.

Fix notification of event to userspace on receving the
tsens interrupt on threshold temperature changes.

Change-Id: Idf818ed171f146ca38a1db2264bf2a17e55ecace
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>