Create constructor of JAudioTrack class

Bug: 70363744
Test: Built successfully (mmm libmedia -j48)
Change-Id: I51e0510039fca2e84d1ced103fea62156cd1e5c2
diff --git a/media/libmedia/Android.bp b/media/libmedia/Android.bp
index 0b4fd25..59703b7 100644
--- a/media/libmedia/Android.bp
+++ b/media/libmedia/Android.bp
@@ -306,6 +306,7 @@
 
     srcs: [
         "AudioParameter.cpp",
+        "JAudioTrack.cpp",
         "MediaPlayer2Factory.cpp",
         "MediaPlayer2Manager.cpp",
         "TestPlayerStub.cpp",
@@ -314,6 +315,7 @@
     ],
 
     shared_libs: [
+        "libandroid_runtime",
         "libaudioclient",
         "libbinder",
         "libcutils",