Only run the wifi display RTSP server on demand, and only on the wifi direct

interface.

Change-Id: I7d3c44cb79cd40e73499f2d7ccf35c69b628e6d7
diff --git a/media/libmediaplayerservice/RemoteDisplay.cpp b/media/libmediaplayerservice/RemoteDisplay.cpp
index 855824a..49f7278 100644
--- a/media/libmediaplayerservice/RemoteDisplay.cpp
+++ b/media/libmediaplayerservice/RemoteDisplay.cpp
@@ -32,13 +32,11 @@
 RemoteDisplay::~RemoteDisplay() {
 }
 
-status_t RemoteDisplay::start() {
+status_t RemoteDisplay::start(const char *iface) {
     mNetSession->start();
     mLooper->start();
 
-    // XXX replace with 8554 for bcom dongle (it doesn't respect the
-    // default port or the one advertised in the wfd IE).
-    mSource->start(WifiDisplaySource::kWifiDisplayDefaultPort);
+    mSource->start(iface);
 
     return OK;
 }