power: qpnp-bms: fake a high OCV when charging completes

When charging is finished and the battery is considered full, the BMS
does not necessarily report 100%. Fix this by faking a high OCV when
the charger notifies BMS of EOC.

Change-Id: I056e71b02f2cd3262b13e5a5a8aa9d1d171ffa3e
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>