audio: Add audio_policy.conf file

- Add audio policy.conf file for MSM8226 target
- Enable tunnel decode by default

Change-Id: Ib63f00b32834b5c2f9365c8ffba261ef36472abc
diff --git a/msm8226.mk b/msm8226.mk
index 2bf4c3c..1e5ebfe 100644
--- a/msm8226.mk
+++ b/msm8226.mk
@@ -3,6 +3,10 @@
 PRODUCT_NAME := msm8226
 PRODUCT_DEVICE := msm8226
 
+# Audio configuration file
+PRODUCT_COPY_FILES += \
+    device/qcom/msm8226/audio_policy.conf:system/etc/audio_policy.conf \
+
 # Bluetooth configuration files
 PRODUCT_COPY_FILES += \
     system/bluetooth/data/main.le.conf:system/etc/bluetooth/main.conf \