Allow system organizer to specify TF override orientation

For embedded -1 TF in the home task, we want it to use the same
orientation as the Launcher activity, so we should allow the TF
orientation to be set as SCREEN_ORIENTATION_BEHIND.

Bug: 331945991
Test: atest TaskFragmentTest TaskFragmentOrganizerControllerTest
Change-Id: I4d3b9533cbc401668a099bd2b61caada1a28e9a1