msm: thermal: Remove D tasks in kernel thermal monitor

Remove D tasks in kernel thermal monitor by moving
wait completion to its interruptible counterpart.
This will reduce the loadavg by 50 percent.

CRs-Fixed: 654474
Change-Id: I5fc82d83170b46393ac66ca354627341fc4b5296
Signed-off-by: Shiju Mathew <shijum@codeaurora.org>