Expose androidx-current for doc generator

Test: No behavior changes
Bug: 144042891
Change-Id: Id03532b03a351381201bf6926cf4b1d4ffaf409a
diff --git a/Android.bp b/Android.bp
index 614307a..5ac05aa 100644
--- a/Android.bp
+++ b/Android.bp
@@ -16,6 +16,13 @@
 }
 
 filegroup {
+    name: "current-androidx-api",
+    srcs: [
+        "current/androidx-api.txt",
+    ],
+}
+
+filegroup {
     name: "metalava-sdk-android-jars",
     srcs: [
         "**/android.jar",