Do not call onConfigurationChanged for appBound position changes.

Since appBounds encodes both dimensions and positions, movement will
cause a diff change. This happens in situations where the dimensions
stay constant, such as dragging a PiP window around.

To avoid flooding the client side with configuration changes, this CL
checks whether the new configuration is equivalent to the existing
configuration with the exception of the position of the appBounds
before sending to the registered callbacks.

Change-Id: I8fbc94458fd9ed3b39494c3587f25e704ec02a7d
Fixes: 63927944
Test: bit FrameworksServicesTests:com.android.server.wm.AppBoundsTests
Test: go/wm-smoke