Add CTS test for android.net.rtp.

Bug: 5975113
Change-Id: I20ec3b172a2d6501048418f4c3da06d1b7144fd3
diff --git a/tests/cts/net/AndroidManifest.xml b/tests/cts/net/AndroidManifest.xml
index 4fa0565..b3556f5 100644
--- a/tests/cts/net/AndroidManifest.xml
+++ b/tests/cts/net/AndroidManifest.xml
@@ -23,6 +23,7 @@
     <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
     <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />