hal: add support for source tracking feature

Fluence module on ADSP is upgraded to support source
tracking, sound focus and audio zoom features. This
change adds support for the same in audio HAL and is
needed to support the features end-to-end.

Source Tracking is the capability to identify the
source of speech. Sound Focus is the capability to
configure which sectors in the 360 degrees plane to
listen to. Audio Zoom is the capability to combine
the sound focus with other technologies so that a user
can listen in on a particular source in a scene.

Change-Id: I019b22d6541e6d1a10552d808c3320a998b86e48
diff --git a/hal/msm8960/platform.c b/hal/msm8960/platform.c
index 4c798b6..bbfa042 100644
--- a/hal/msm8960/platform.c
+++ b/hal/msm8960/platform.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
  * Not a contribution.
  *
  * Copyright (C) 2013 The Android Open Source Project
@@ -1153,3 +1153,9 @@
 {
     return 0;
 }
+
+int platform_set_audio_device_interface(const char * device_name __unused,
+                                        const char *intf_name __unused)
+{
+    return -ENOSYS;
+}