Change last-released filegroup

There were two different filegroups referencing the same last released
APIs. Delete the manually defined one and switch references over to use
the one defined by prebuilt_apis.

Bug: 155197156
Test: m
Change-Id: Ib15d2c08e6400546ca03de6bfd4e5cbcc938c992
diff --git a/ApiDocs.bp b/ApiDocs.bp
index fbc5c9d..c41a200 100644
--- a/ApiDocs.bp
+++ b/ApiDocs.bp
@@ -79,7 +79,7 @@
         "sdk-dir",
         "api-versions-jars-dir",
     ],
-    previous_api: ":last-released-public-api",
+    previous_api: ":android.api.public.latest",
     merge_annotations_dirs: [
         "metalava-manual",
     ],