Split libaaudio.so to internal and NDK part

This change moves almost everything from libaadio.so to
separate libaaudio_internal.so library. This is done to
avoid exporting symbols which apps are not allowed to use
but have them available for platform libraries by exporting
them from libaaudio_internal.so

Bug: http://b/69603741
Test: make
Change-Id: If93118ed2c266faf2964abf21e17b0b13df493d2
diff --git a/services/oboeservice/Android.bp b/services/oboeservice/Android.bp
index 655f017..1b7a20c 100644
--- a/services/oboeservice/Android.bp
+++ b/services/oboeservice/Android.bp
@@ -43,7 +43,7 @@
     ],
 
     shared_libs: [
-        "libaaudio",
+        "libaaudio_internal",
         "libaudioclient",
         "libaudioflinger",
         "libbase",