power: smb1360: Correct the array index in current gain adjustment

The 1st element value of the array is overridden and it causes the wrong
register is programed via OTP backup registers. Fix it.

CRs-Fixed: 846212
Change-Id: I9e9c1c538dc63bde4326fa2a1a3a459428d45afe
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>