Move libmediahelper into a new folder.

This change mainly aims at refactoring libmediahelper. Libmediahelper
doesn't need to be stored in media folder. In that case, move
libmediahelper related file to a new folder. In the meantime, move
AudioParameter.h from libaudioclient to libmediahelper. There is no
need to keep AudioParameter.h in libaudioclient while AudioParameter.cpp
is in libmediahelper.

Test: make
Bug: 135621476
Change-Id: Icce6615b7e3a68be8b7492f2a91922ab04464ca2
Merged-In: Icce6615b7e3a68be8b7492f2a91922ab04464ca2
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",