qcom-charger: smb138x: fix buck damage on v1.1 hardware

Buck damage was seen to go away once the dead time were increased
in addition to increasing the OOB comparator threshold.

CRs-Fixed: 1055113
Change-Id: I8979d203fc7c35ec23e23874c8dd8f980a1cc619
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>