misc: therm_est: Unregister tz and cdev in shutdown

misc: therm_est: Unregister tz and cdev in shutdown

Unregister thermal zone and cooling device in shutdown callback to prevent
unwanted thermal operating while shutdown processing.

Bug 1515432

Change-Id: I49a13618f7b8f8d5b55a8e960676e7357891fe89
Signed-off-by: Jinyoung Park <jinyoungp@nvidia.com>
Reviewed-on: http://git-master/r/416278
(cherry picked from commit cb140feb445ff6dce4984bed527eca56191180a8)
Reviewed-on: http://git-master/r/436687
GVS: Gerrit_Virtual_Submit
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>