audio: add separate audio Input path feature

- Separate audio input path can be set using input source of audio parameter
    1. Voice Recognition
    2. Camcording
    3. etc.

Change-Id: I7eaf250df98cdfd8a208d243da277756bf5ee36a
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 11fa716..ddaff38 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -31,6 +31,7 @@
 
 BOARD_USES_ALSA_AUDIO:= true
 BOARD_USES_FLUENCE_INCALL := true
+BOARD_USES_SEPERATED_AUDIO_INPUT := true
 BOARD_HAVE_BLUETOOTH := true
 
 TARGET_NO_RADIOIMAGE := true