Make keyguard exit animation to remote animation.

The change is disabled by default. To enable remote animation, one needs
to set a property and to restart the WMS.

% adb shell setprop persist.wm.enable_remote_keyguard_animation 1
% adb shell stop && adb shell start

Test: Existing tests pass.
Bug: 175686676

Change-Id: I1cd6a86c2c7eb0a2bd09eb3dae4f408fe32f4254