power: vm-bms: Minor fixes in VMBMS

1. Convert the shutdown OCV to uV for SOC lookup

2. Report EOC to charger only if STATUS != FULL

Change-Id: Ic3e099013eeb7a593dd5a3bb93c60f9c824ad186
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>