ARM: dts: msm: Update thermal property for adc_tm channels on SDM670

ADC_TM channels are registered with of_thermal to support thermal core
framework to read temperature, set temperature thresholds and
receive notifications when temperature thresholds are crossed.
Update thermal property for adc_tm channels.

Change-Id: I15be7016e66c022b2f817f006a81cfdd1ddc4cc0
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>