send default sub change broadcast in multisim mode

1. make sure always send default subscription change broadcast when
allIccQueryDone.

2. make send default subscription change broadcast when users changed
preferred voice/data sub or fallback subId which triggers
default subId update.

Bug: 132209632
Change-Id: I43ab6eef514141b9cdaf7c324bc8fda08ff0657f
(cherry picked from commit 3db071e5)
Merged-in: I43ab6eef514141b9cdaf7c324bc8fda08ff0657f