msm: thermal: Store temperature of tsens on kernel panic notification

Register KTM with panic notifier with a callback on boot and
on callback store all tsens temperature into static variable.
This will help rule out or confirm role of thermal for any
kernel crash.

Change-Id: Idb1315e08c82e50c31cf0aff2c4310162d33c7a2
Signed-off-by: Anji Jonnala <anjir@codeaurora.org>