Modify AVxEncoderThreadTest to test temporal filter MT

This CL enables temporal filtering in AVxEncoderThreadTest and
AVxEncoderThreadTestLarge. The number of frames being tested is 6.
The value of arnr_maxframes is set to 5 to enable KF filtering.
Also, g_lag_in_frames is set to 6 with an additional parameter
max_gf_interval being set to 4 in order to enable ARF filtering.

Change-Id: Ia21041ffc76b54260442cb064c21b7f31f19a728
diff --git a/test/ethread_test.cc b/test/ethread_test.cc
index 04ee4d7..6c2107b 100644
--- a/test/ethread_test.cc
+++ b/test/ethread_test.cc
@@ -230,7 +230,7 @@
     SetMode(encoding_mode_);
 
     if (encoding_mode_ != ::libaom_test::kRealTime) {
-      cfg_.g_lag_in_frames = 5;
+      cfg_.g_lag_in_frames = 6;
       cfg_.rc_end_usage = AOM_VBR;
       cfg_.rc_2pass_vbr_minsection_pct = 5;
       cfg_.rc_2pass_vbr_maxsection_pct = 2000;
@@ -255,9 +255,10 @@
       encoder->Control(AV1E_SET_ROW_MT, row_mt_);
       if (encoding_mode_ != ::libaom_test::kRealTime) {
         encoder->Control(AOME_SET_ENABLEAUTOALTREF, 1);
-        encoder->Control(AOME_SET_ARNR_MAXFRAMES, 7);
+        encoder->Control(AOME_SET_ARNR_MAXFRAMES, 5);
         encoder->Control(AOME_SET_ARNR_STRENGTH, 5);
         encoder->Control(AV1E_SET_FRAME_PARALLEL_DECODING, 0);
+        encoder->Control(AV1E_SET_MAX_GF_INTERVAL, 4);
       } else {
         encoder->Control(AOME_SET_ENABLEAUTOALTREF, 0);
         encoder->Control(AV1E_SET_AQ_MODE, 3);