power: qpnp-qg: Add support for batt-soc based SOC scaling (BASS)

At cold temperatures, when the load on battery suddenly drops
there is a possibility of monotonic-SOC being stuck for a long
time due to a rise in system SOC. This leads to a bad UX.

Fix this by gradually dropping the monotonic-SOC if the
battery-SOC has dropped by 1%, irrespective of the increase
in system SOC.

Change-Id: I5da1cf368d523768d0b267b314394612934a620e
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>