power: qpnp-vm-bms: Enable ADC voltage notifications to wake up BMS

Use the ADC-TM to wake up the system and notify BMS if battery
voltage drops below threshold.
Also add ADC-TM phandle in VM-BMS node and update low battery
voltage threshold to 3.45V.

Change-Id: I850d789a5d5687f940829e8b38636b08e17f6822
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>