ARM: dts: msm: Update VADC channels on SDM845 platforms

Register VADC channels with of_thermal to support thermal
core framework to read temperature. Since VADC driver
registers the sensors with thermal zone to read the
temperature from the thermistors remove corresponding
sensors added by VADC_TM.

Change-Id: I34bd9b5656daaffec4e02bc5bdcb23c60514706a
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>