power: qpnp-qg: Add the SDAM flash-ocv offset

On PM2250 the PBS sequence expects the battery-OCV
to output the right flash-boost output voltage. Provide
the same in a SDAM offset.

Change-Id: I9d43375d96de5a199c6a87c55e5c1079549b23ee
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>