[RESTRICT AUTOMERGE] Add import of MAX_APP_TRANSITION_DURATION

The commit at ag/10876662 did not contain a required import. This change
fixes the build.

Bug: 145728687
Test: `mma` in frameworks/base/services/core/java/com/android/server/wm/

Change-Id: Ic37e2dc8498b0f6f5308653f4f9935038a486001
diff --git a/services/core/java/com/android/server/wm/AppWindowToken.java b/services/core/java/com/android/server/wm/AppWindowToken.java
index 23af7d6..6cf1e98 100644
--- a/services/core/java/com/android/server/wm/AppWindowToken.java
+++ b/services/core/java/com/android/server/wm/AppWindowToken.java
@@ -38,6 +38,7 @@
 import static com.android.server.policy.WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
 import static android.view.WindowManager.TRANSIT_UNSET;
 
+import static com.android.server.wm.AppTransition.MAX_APP_TRANSITION_DURATION;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ADD_REMOVE;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ANIM;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_APP_TRANSITIONS;