Add support for python_defaults modules

Test: python_test.go
Change-Id: I2077414a5b06da5e660a1b48bfdb2eb926fb702f
diff --git a/Android.bp b/Android.bp
index df3babc..a2ce8a3 100644
--- a/Android.bp
+++ b/Android.bp
@@ -238,6 +238,7 @@
         "python/androidmk.go",
         "python/binary.go",
         "python/builder.go",
+        "python/defaults.go",
         "python/installer.go",
         "python/library.go",
         "python/python.go",