zenfone6: use custom policy hal

Change-Id: Ifbf88f81240069b20f39e32a6932ef4957736ae3
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 46ef90f..d722239 100755
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -55,6 +55,9 @@
 # Api
 PRODUCT_SHIPPING_API_LEVEL := 27
 
+# Audio
+USE_CUSTOM_AUDIO_POLICY := 1
+
 # Bluetooth
 BOARD_HAVE_BLUETOOTH := true
 BOARD_HAVE_BLUETOOTH_QCOM := true