Fix split layout didn't update config when rotation

We use display callback to update split layout config when rotate
case, but the DisplayInfo is nullable so we cannot ensure it is
always updated, so we still need to handle it on onTaskInfoChanged
if configuration changed case.

Fix: 274050160
Fix: 277180049
Test: manual
Test: pass existing tests
Change-Id: Icd5d6c485ae769ebb3aa59ba76c100a4efbf3f8a