power: smb5: 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: If384fbc5f394f03c6b0d84e5fc7aebce4a844059
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>