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

The skuh 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: I63fb02244b55b51d967b85a90cc700ef1764d20d
Signed-off-by: Jie Cheng <rockiec@codeaurora.org>