Set use_current for current.txt.

This option is being added in order to add current.txt into the build
graph.

Bug: 119117395
Test: m nothing (checks the build graph)
Change-Id: I98490d70ad297e1628ed95fbebd082c03b287d63
diff --git a/Android.bp b/Android.bp
index 05ca928..1c6e1b2 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,5 +1,6 @@
 hidl_package_root {
     name: "android.hardware",
+    use_current: true,
 }
 
 cc_defaults {