power: qpnp-fg-gen3: add support for configuring cutoff current

Add support to configure cutoff current that will be used for
cutoff SOC estimate.

CRs-Fixed: 2160773
Change-Id: I26730f35659a227717a33682683746f13f1175eb
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>