dt-bindings: Add DT property to disable SW based thermal-regulation

Software based thermal mitigation is enabled for platforms with
incorrect ADC channel mapping.
Add "qcom,disable-sw-thermal-regulation" DT property to disable
this feature.

Change-Id: Ie53d4274f0701905f1eb60c8a84186675fbe1fc8
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>