Settings: Fix the issue ArrayIndexOutOfBoundsException in MSimStatus.

The length of sim summary is the number of sim cards. But the
index subId is 2. So caused ArrayIndexOutOfBoundsException.

The slotId means card slot.  Use slotId instead of subId as the index of sim
summary.

CRs-Fixed: 764580

Change-Id: I225ec01925335632376c1eabf5e1bbb05f882d09