Fix temporal display orientation by pip activity

Change to override getOrientation(int) because that is how the parent
gets candidate orientation from children.

Also move the methods to Task because it will be the generic container.

Fix: 152298974
Bug: 151727009
Test: atest TaskRecordTests#testNotSpecifyOrientationByFloatingTask

Change-Id: I9877bb597bf5aa97114673aa079cc72775ff0515