hal: enable compilation of AudioPolicyManager

- Enable compilation of AudioPolicyManager.

Change-Id: I52fd5ba07a13e2456246329b1932701e2b2c434a
diff --git a/Android.mk b/Android.mk
index 505c9d5..111e272 100644
--- a/Android.mk
+++ b/Android.mk
@@ -8,6 +8,7 @@
 include $(MY_LOCAL_PATH)/hal/Android.mk
 include $(MY_LOCAL_PATH)/voice_processing/Android.mk
 include $(MY_LOCAL_PATH)/mm-audio/Android.mk
+include $(MY_LOCAL_PATH)/policy_hal/Android.mk
 endif
 
 endif