qcom: smb2: Fix FCC/Float voltage configuration from device tree

FCC and Float voltage is configured by battery driver using
power_supply framework (main_psy), re-run FCC/FV election once
main_psy is available to ensure FCC/Float voltage is configured
and reflected on hardware.
While at it, add check for valid "pl_psy" before using it.

CRs-fixed: 2028082
Change-Id: I2f5dc174eacf325ba27186b07c89bb7d438f061b
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>