power: qpnp-charger: Add VCHG_LOOP_DBC_BYPASS property

Add a property VCHG_LOOP_DBC_BYPASS in battery power supply. It is used
for enabling/disabling the buck VCHG_LOOP debouncer timer.

Change-Id: If3f1ecb56abe2319e9defb6ef03a83b972632ef4
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>