thermal: qpnp-adc-tm: add new scale function for skue battery thermistor

The skue is using the different battery thermistor and mapping table
from the default. A new scale function is needed to use this mapping
table in the thermal adc driver.

Change-Id: Ib154bafe821ceae33803efced3c15321a39f1dad
Signed-off-by: Chunmei Cai <ccai@codeaurora.org>