Added OnSetRequestedOrientation callback

DisplayRotation disables Auto-Rotation for immersive applications.
But during the rotation of the device, application may change
the requested orientation by calling
ActivityRecord.setRequestedOrientation

This CL makes sure that onProposedRotationChanged gets reevaluated
if previously user was shown with the rotation button, and
then setRequestedOrientation being invoked by the application.

Bug: 275810916
Test: atest DisplayRotationTests ActivityRecordTests
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:fe766df5e0908d6678ec01dec4ec7d1ab95bc840)
Change-Id: I4fe6ef7716398047a757a5c761f316f6145d00b6