power: smb1390-psy: battery: Fix FCC threshold to disable slave CP

Currently, the FCC threshold to disable the slave CP is configured
based on CC mode status, this makes threshold different for CC and
CV mode. Fix this, by configuring the threshold irrespective of CC
mode status.

Change-Id: I3c7c2fee306a02d7ea076b7e836fa330b9295a21
Signed-off-by: Sahil Chandna <chandna@codeaurora.org>