Fix AppWindowTokenTests#testLandscapeSeascapeRotationByPolicy

Previously this test was marked as blocked by b/35034729. This bug
has been fixed, however the test still fails due to other issues
addressed here.

Addressed issues are as follows:
1. Updating rotation by display manager requires a display with the
default display id present. This display is removed during setup. The
first id to be used by a display after this point is the
default id + 1. We already have logic in place to avoid collisions so
it is safe and correct to start out at the default id.
2. Without allowing the animator to complete its steps after a
rotation, future rotations will be deferred. We must simulate the
steps taken by the and resulting from the animtor. These include
marking the orientation change as complete and performing a surface
placement afterwards.

Bug: 35034729
Test: bit FrameworksServicesTests:com.android.server.wm.AppWindowTokenTests
Change-Id: Ib01c047ac49982a4a3c1debaa3cee1b7b9b53632