hwmon: qpnp-adc: Add battery thermistor mapping table

Add mapping table used for converting battery thermistor
voltage to the corresponding temperature based on
the qrd resistive divider circuit.

Change-Id: I5d3a8fd446cc59e30192485f28a9436e5517350f
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>