thermal: of-thermal: Add devm version of thermal_zone_of_sensor_register

Add resource managed version of thermal_zone_of_sensor_register() and
thermal_zone_of_sensor_unregister().

This helps in reducing the code size in error path, remove of
driver remove callbacks and making proper sequence for deallocations.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>