Remove unnecessary droiddoc args

- tag_name does nothing anymore
- api filenames are irrelevant with the check_api clause

Bug: 152479829
Test: m
Change-Id: I73ae2e7c1a7d26110138dc655007ac7a8ec388f7
diff --git a/tools/ahat/Android.bp b/tools/ahat/Android.bp
index a08a03d..85aca4c 100644
--- a/tools/ahat/Android.bp
+++ b/tools/ahat/Android.bp
@@ -19,9 +19,6 @@
     ],
     custom_template: "droiddoc-templates-sdk",
     args: "-stubpackages com.android.ahat:com.android.ahat.*",
-    api_tag_name: "AHAT",
-    api_filename: "ahat_api.txt",
-    removed_api_filename: "ahat_removed_api.txt",
     check_api: {
         current: {
             api_file: "etc/ahat_api.txt",