Convert usb service .mk -> .bp.

Test: none
Bug: 33420795
Change-Id: I4b489a08d850b7c49231e0daadcb9d96e57a7e55
diff --git a/usb/Android.bp b/usb/Android.bp
index 33f70eb..ed19a37 100644
--- a/usb/Android.bp
+++ b/usb/Android.bp
@@ -1,5 +1,6 @@
 // This is an autogenerated file, do not edit.
 subdirs = [
     "1.0",
+    "1.0/default",
     "1.0/vts/functional",
 ]