Revert "Revert "Move libmediahelper into a new folder.""

This reverts commit a0877dc731067dd95635b2be3e893f1fe60bf3a1.

Reason for revert: Should work with go/pag/1465463 merging to master.

Change-Id: I17217744eacabf15621d4a5aac9dd1678e37e4ba
diff --git a/services/audioflinger/Android.bp b/services/audioflinger/Android.bp
index 96ad54b..d50a556 100644
--- a/services/audioflinger/Android.bp
+++ b/services/audioflinger/Android.bp
@@ -60,6 +60,10 @@
         "libsndfile",
     ],
 
+    header_libs: [
+        "libmedia_headers",
+    ],
+
     cflags: [
         "-DSTATE_QUEUE_INSTANTIATIONS=\"StateQueueInstantiations.cpp\"",
         "-fvisibility=hidden",