message: av1: add a few controls to wrapper
  this will speed up realtime encoding.
  Cr-Commit-Position: refs/heads/master@{#31431}
diff: @@ -254,6 +254,24 @@ int LibaomAv1Encoder::InitEncode(const VideoCodec* codec_settings,
  << " on control AV1E_SET_MAX_INTRA_BITRATE_PCT.";
  return WEBRTC_VIDEO_CODEC_ERROR;
  }
  + ret = aom_codec_control(&ctx_, AV1E_SET_COEFF_COST_UPD_FREQ, 2);
  + if (ret != AOM_CODEC_OK) {
  + RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret
  + << " on control AV1E_SET_COEFF_COST_UPD_FREQ.";
  + return WEBRTC_VIDEO_CODEC_ERROR;
  + }
  + ret = aom_codec_control(&ctx_, AV1E_SET_MODE_COST_UPD_FREQ, 2);
  + if (ret != AOM_CODEC_OK) {
  + RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret
  + << " on control AV1E_SET_MODE_COST_UPD_FREQ.";
  + return WEBRTC_VIDEO_CODEC_ERROR;
  + }
  + ret = aom_codec_control(&ctx_, AV1E_SET_MV_COST_UPD_FREQ, 3);
  + if (ret != AOM_CODEC_OK) {
  + RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret
  + << " on control AV1E_SET_MV_COST_UPD_FREQ.";
  + return WEBRTC_VIDEO_CODEC_ERROR;
  + }
  return WEBRTC_VIDEO_CODEC_OK;
  }
  