zenfone6: Bind mount our own audio policy configuration

Change-Id: I830b0488d34f76169bceb33503eb701b3dfbfd27
diff --git a/sepolicy/private/file_contexts b/sepolicy/private/file_contexts
index ff53b59..f7082d0 100644
--- a/sepolicy/private/file_contexts
+++ b/sepolicy/private/file_contexts
@@ -5,3 +5,6 @@
 /batinfo(/.*)?          u:object_r:demoapp_file:s0
 /voucher(/.*)?          u:object_r:voucher_file:s0
 /xrom(/.*)?             u:object_r:xrom_file:s0
+
+# Audio
+/system/etc/audio_policy_configuration.xml    u:object_r:vendor_configs_file:s0