Stop ignoring app's requested orientation on Auto.

In Q we started to have pillarbox support for apps that request to be in
portrait. Therefore there is no point to block out app's orientation
request anymore. Also, we shouldn't be putting an app in an orientation
it doesn't support.

Bug: 25267450
Bug: 113252523
Bug: 129931485
Test: Builds.
Change-Id: I5e447538975fb5c5ece61d9325c87500e14c69c8