SystemUI: Make GhbmIlluminationListener a public interface

Change-Id: I8b70d796e3b0b207f07dcb94b2ff4b57b125a890

Author: ralph950412

packages/SystemUI/src/com/android/systemui/biometrics/UdfpsSurfaceView.java

@@ -41,7 +41,7 @@ public class UdfpsSurfaceView extends SurfaceView implements SurfaceHolder.Callb
     /**
      * Notifies {@link UdfpsView} when to enable GHBM illumination.
      */
-    interface GhbmIlluminationListener {
+    public interface GhbmIlluminationListener {
         /**
          * @param surface the surface for which GHBM should be enabled.
          * @param onDisplayConfigured a runnable that should be run after GHBM is enabled.