qcom-charger: smb138x-charger: change power supply type to usb parallel

Currently the type of the parallel power supply is
POWER_SUPPLY_TYPE_BATTERY. Change it to POWER_SUPPLY_TYPE_USB_PARALLEL.

Change-Id: Ic7652e43781f39d3137fb55f2fec2423e457fac4
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>