power: bcl_peripheral: Account derated threshold for false trigger

Use derated battery current threshold value for
determining false trigger. Otherwise a trigger from
deadtime threshold will be ignored by the driver.

CRs-Fixed: 808415
Change-Id: I309de953f76a8202dbd205f1716d20c5d8a5f62f
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>