Add PhoneStateListener#onPreferredDataSubIdChanged

When SubscriptionManager#SetPreferredData changes preferredDataSub,
SubscriptionController notifies TelephonyRegistry and then notifies
all PhoneStateListeners that listen to the event.

Bug: 115550764
Test: unittest
Change-Id: Icb0b349b9f07a52d7d9c5e8512f731986f1a1fa3
Merged-In: Icb0b349b9f07a52d7d9c5e8512f731986f1a1fa3