power: qpnp-bms: detect battery removal in offmode

Use the smbb battery interface driver's bat_pres_status battery
removal circuit to detect whether a battery has been removed when
the device is powered off.

Change-Id: Ifb219455d2f563c6052ec9e8e8c690dd12070c2f
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>