ARM: dts: msm: Add ADC channels for SDM845

Add support to read VADC channels such as vph_pwr, vcoin
and on board thermistors. Add ADC_TM channels to support
clients to set threshold and receive notification.

Change-Id: I7df64c5738bac8e438902eec1775a375823e4315
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>