ARM: dts: msm: Add VADC channels for mdmcalifornium

Add support to read PA thermistors and case thermistors
on MDMCALIFORNIUM platforms. Register the VADC channels
for thermistors as part of thermal zone for clients to
read the temperature from thermal zone sysfs nodes.

Change-Id: I02bdb5d73a44daac75e7c8bc69c4f49a26ec6bba
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>