Rotate only VR secondary display

The rotation tracking and logic in PhoneWindowManager assumes
that there is only one display in the system, so we can't enable
rotation for all displays just yet. For now will update only
VR display.

Change-Id: Ia35b4e919155a043eae4e3e97bd15a583e9476e2
Fixes: 64393199
Test: android.server.cts.ActivityManagerDisplayTests
Test: #testRotationNotAffectingSecondaryScreen