drivers: qmi_sensor: Add support for mmw ADC thermistors

Add support for the new mmw related ADC thermistor support. The support
includes for the qmi sensors mmw_pa1, mmw_pa2, mmw_pa3, and
sdr_mmw_therm.

Change-Id: I07267b84d4287ac04824697b14f8355cfae47dfd
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>