frameworks/base: unlink death notifications of Vibrate requests

Death notifications of Vibrate requests isn't needed when
broadcast of ACTION_SCREEN_OFF is received.

Change-Id: Ic411525fa8ce1fce3fa215314c54440ce837e41a
diff --git a/services/java/com/android/server/VibratorService.java b/services/java/com/android/server/VibratorService.java
index 86c30f8..7135391 100755
--- a/services/java/com/android/server/VibratorService.java
+++ b/services/java/com/android/server/VibratorService.java
@@ -379,6 +379,12 @@
             if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
                 synchronized (mVibrations) {
                     doCancelVibrateLocked();
+
+                    int size = mVibrations.size();
+                    for(int i = 0; i < size; i++) {
+                        unlinkVibration(mVibrations.get(i));
+                    }
+
                     mVibrations.clear();
                 }
             }