Fetch filtered api-versions.xml for 'current'

Bug: 186478867
Test: run script
Change-Id: I38d6b6ce62b784601503df1a4e0e94215e84268a
diff --git a/update_prebuilts/update_prebuilts.py b/update_prebuilts/update_prebuilts.py
index da1821f..003e2d9 100755
--- a/update_prebuilts/update_prebuilts.py
+++ b/update_prebuilts/update_prebuilts.py
@@ -560,6 +560,9 @@
                     dst_path = path(target_dir, filename)
                     mv(src_path, dst_path)
 
+            # Filtered API DB is currently only available for "public"
+            fetch_artifacts(framework_sdk_target, build_id, {'api-versions-public-filtered.xml': path(target_dir, 'data/api-versions-filtered.xml')})
+
     return True
 
 def update_makefile(build_id):