audio: add Dual MIC scenario in call feature

- Dual MIC solution(Fluence) feature in Built-in MIC used scenarioes.
    1. Handset
    2. 3-Pole Headphones

Change-Id: I5cb7d909785ac583ced01276b987c4ba811d8404
diff --git a/alsa_sound/AudioHardwareALSA.cpp b/alsa_sound/AudioHardwareALSA.cpp
index d108d22..4c63990 100644
--- a/alsa_sound/AudioHardwareALSA.cpp
+++ b/alsa_sound/AudioHardwareALSA.cpp
@@ -98,7 +98,11 @@
             musbPlaybackState = 0;
             musbRecordingState = 0;
 #endif
+#ifdef USES_FLUENCE_INCALL
+            mDevSettingsFlag |= TTY_OFF | DMIC_FLAG;
+#else
             mDevSettingsFlag |= TTY_OFF;
+#endif
             mBluetoothVGS = false;
             mFusion3Platform = false;