Convert to Android.bp

See build/soong/README.md for more information.

Change-Id: Ib5abad8bcb63bd3f3aa19a08817276fe21902515
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..6fd6c72
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,4 @@
+subdirs = [
+    "media/libmedia",
+    "media/libstagefright/foundation",
+]