Fixed issue with screen rotation not working for landscape<->seascape

Problem as introduced in the refactor to change how configuration works
in activity manager in ag/1460784. With the new change we don't call back
into window manager to set new configuration if there are no changes.
The new change is correct, however window manager was relying on this to
unfreeze the display since the rotation changed.
We now have activity manager return if it updated the configuration to
window manager when the rotation changes do window manager can decide
if it needs to perform additional actions like unfreezing the display.

Bug: 31916697
Test: CTS and Manual testing.
CTS: cts-tradefed run commandAndExit cts-dev --module CtsServicesHostTestCases --test android.server.cts.ActivityManagerDockedStackTests
Manual: Launch an app that suports all orientations and rotate it from
landscape to seascape.
Change-Id: I36ddeff1ccc9f6089227147b117a865571b8571e