libeffects: AEC mobile mode set as default

AEC mobile mode enabled by default for new webrtc

Test: Tested using standalone application by listening to the outputs.

Change-Id: Ic22191c68f2f3a67b515a46338529cd882aba58a
diff --git a/media/libeffects/preprocessing/PreProcessing.cpp b/media/libeffects/preprocessing/PreProcessing.cpp
index f2f74a5..d8840b2 100644
--- a/media/libeffects/preprocessing/PreProcessing.cpp
+++ b/media/libeffects/preprocessing/PreProcessing.cpp
@@ -775,7 +775,7 @@
 #else
     effect->session->config =
         effect->session->apm->GetConfig() ;
-    effect->session->config.echo_canceller.mobile_mode = false;
+    effect->session->config.echo_canceller.mobile_mode = true;
     effect->session->apm->ApplyConfig(effect->session->config);
 #endif
     return 0;