Remove refs to QSFragment

Make sure that the tiles are not connected to QSFragment when the
QSPanel is detached.

Test: build, destroy fragment a couple times
Fixes: 157069009
Change-Id: I8298a6a0ebf8e3764038857b633f70816fe0b2db

packages/SystemUI/src/com/android/systemui/qs/QSFragment.java

@@ -157,6 +157,7 @@ public class QSFragment extends LifecycleFragment implements QS, CommandQueue.Ca
         if (mListening) {
             setListening(false);
         }
+        mQSCustomizer.setQs(null);
     }
 
     @Override

packages/SystemUI/src/com/android/systemui/qs/QSPanel.java

@@ -361,9 +361,13 @@ public class QSPanel extends LinearLayout implements Tunable, Callback, Brightne
         if (mHost != null) {
             mHost.removeCallback(this);
         }
+        if (mTileLayout != null) {
+            mTileLayout.setListening(false);
+        }
         for (TileRecord record : mRecords) {
             record.tile.removeCallbacks();
         }
+        mRecords.clear();
         if (mBrightnessMirrorController != null) {
             mBrightnessMirrorController.removeCallback(this);
         }