Sent hint to Wifi driver when enabling WFD.

Bug: 8521148
Change-Id: I53b4cf7a3714b28f9df457e559abe92711c02cef
diff --git a/services/java/com/android/server/display/WifiDisplayController.java b/services/java/com/android/server/display/WifiDisplayController.java
index a83675e..8c8b360 100644
--- a/services/java/com/android/server/display/WifiDisplayController.java
+++ b/services/java/com/android/server/display/WifiDisplayController.java
@@ -481,6 +481,7 @@
             mRemoteDisplayConnected = false;
             mHandler.removeCallbacks(mRtspTimeout);
 
+            mWifiP2pManager.setMiracastMode(WifiP2pManager.MIRACAST_DISABLED);
             setRemoteSubmixOn(false);
             unadvertiseDisplay();
 
@@ -626,6 +627,7 @@
             }
 
             setRemoteSubmixOn(true);
+            mWifiP2pManager.setMiracastMode(WifiP2pManager.MIRACAST_SOURCE);
 
             final WifiP2pDevice oldDevice = mConnectedDevice;
             final int port = getPortNumber(mConnectedDevice);