ARM: dts: msm: Add GPIO configurations for ADC channels on trinket

Add pinctrl configurations for ADC channels using GPIOs on
trinket. In addition, remove xo_therm channel on PMI632 for
trinket as it is not used.

Change-Id: I39558e313fc0387c29d89e980279ac76d75fb53c
Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>