hwmon: qpnp-adc-voltage: Add temperature compensation for PM8916 v2.0

Add VBAT and OCV temperature compensation for PM8916
v2.0 for TSMC and GF parts.

The temperature compensation is required on top of
gain/offset calibration to compensate for variations
due to chip revision, manufacturer and temperature.

Change-Id: I1e773a229f5a28780bffaf70979992fe4ed25e42
Signed-off-by: Dipen Parmar <dipenp@codeaurora.org>