ARM: dts: msm: Update adc_tm support for SDM670

Register ADC_TM channels with of_thermal to support thermal core
framework to read temperature, set temperature thresholds and receive
notifications when temperature thresholds are crossed.

Change-Id: Id501334023606089e322d0e8667556a80f82071d
Signed-off-by: Lakshmi Sunkara <lakshmis@codeaurora.org&gt;a>
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>