ARM: dts: msm: Add ADC channel nodes for sdxprairie

Add VADC peripheral channels to read on board system thermistors
from pmxprairie and pm8150b. Add thermal zones to read on board
system thermistors through thermal sysfs.

Change-Id: I7312300445e0b2f1dea8c11664b04f1365632412
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>