power: vm_bms: add notification to restart charging

Update BMS driver to support SOC based resume of charging and
to report battery charging status to charger.

Also, add support to get charging mode(CV) from charger driver
via the taper charge notification.

CRs-Fixed: 703710
Change-Id: Ia406b995506fe686d78cb52e93f84f7a1f45292e
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>