Update makefiles for hidl adapter.

Bug: 37518178
Test: manual
Change-Id: I50e999907d3c64d2b039272b823971998da64d1b
diff --git a/drm/Android.bp b/drm/Android.bp
index 33f70eb..ed19a37 100644
--- a/drm/Android.bp
+++ b/drm/Android.bp
@@ -1,5 +1,6 @@
 // This is an autogenerated file, do not edit.
 subdirs = [
     "1.0",
+    "1.0/default",
     "1.0/vts/functional",
 ]