hwmon: qpnp-adc: add PM8110 2.0 temperature compensation info

Add in support for PM8110 2.0 temperature compensation. Also, fix a few
bugs in the ADC compensation algorithm where 25C was treated as 2.5C.

Change-Id: Iafa3ceca2b5938432116ecc905dd54b2da7c4b0b
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>