Populate the subId for the slotId before calling the subIdUpdated callback

The callback onSubIdUpdated() is called before assigning the new value to
mSubIdForSlot[]. If a callback registers for onSubIdUpdated and calls
getPhoneIdBySubId(), an old faulty value will be returned.

Populate the subIdForSlotId before calling the onSubIdUpdated() callback.

Change-Id: I72cd43723b0c84e76aaaea2ee49ff2216827b359
CRs-Fixed: 782027