power: qpnp-fg: Add support to configure resume-soc in FG

resume soc can be configured for automatic recharge in FG. This
along with the recharge threshold source configuration in charger
will make the recharging to be based on FG.

CRs-Fixed: 723434
Change-Id: If63e92fee491bb9cadda00cb7384bc169b754940
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>