mfd: pm8xxx-misc: Add the pm8xxx coincell chg API

The API enables/disables the coincell charger. It also configures
the coincell charger's voltage and register settings.

The charger allows the coincell (connected to VCOIN) to charge
from VBAT.

Change-Id: Id3802e37d8100e6a72de9fd263e7d201a7a346d2
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
2 files changed