hardware: move audio_policy.h to system/

Change-Id: I392c5f91db88ca923dead7202064169edc1cc0c7
Signed-off-by: Dima Zavin <dima@android.com>
diff --git a/modules/audio/audio_policy.c b/modules/audio/audio_policy.c
index 8afef5f..1b64693 100644
--- a/modules/audio/audio_policy.c
+++ b/modules/audio/audio_policy.c
@@ -24,7 +24,7 @@
 
 #include <hardware/hardware.h>
 #include <system/audio.h>
-#include <hardware/audio_policy.h>
+#include <system/audio_policy.h>
 #include <hardware/audio_policy_hal.h>
 
 struct default_ap_module {