Making audio network adaptor config proto a JAVA package.

BUG=webrtc:6303

Review-Url: https://codereview.webrtc.org/2568043002
Cr-Commit-Position: refs/heads/master@{#15555}

webrtc/modules/audio_coding/audio_network_adaptor/config.proto

diff --git a/webrtc/modules/audio_coding/audio_network_adaptor/config.proto b/webrtc/modules/audio_coding/audio_network_adaptor/config.proto
index 3c678fc..302f52c 100644
--- a/webrtc/modules/audio_coding/audio_network_adaptor/config.proto
+++ b/webrtc/modules/audio_coding/audio_network_adaptor/config.proto
@@ -1,5 +1,7 @@
 syntax = "proto2";
 option optimize_for = LITE_RUNTIME;
+option java_package = "org.webrtc.AudioNetworkAdaptor";
+option java_outer_classname = "Config";
 package webrtc.audio_network_adaptor.config;
 
 message FecController {