don't require package_name for non-override android_apps

For a non-override android_app, we can assume that the privapp_allowlist
already contains the correct package_name, and so we don't need to
overwrite it in this case.

Bug: 242509786
Test: go test
Merged-In: I0f137e34cae3478dc8b9178d138121ff1d936f07
Change-Id: I0f137e34cae3478dc8b9178d138121ff1d936f07
diff --git a/apex/apex_test.go b/apex/apex_test.go
index c1d80a3..2dad22b 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -6260,8 +6260,7 @@
 			sdk_version: "current",
 			system_modules: "none",
 			privileged: true,
-			privapp_allowlist: "perms.xml",
-			package_name: "com.android.AppFooPriv",
+			privapp_allowlist: "privapp_allowlist_com.android.AppFooPriv.xml",
 			stl: "none",
 			apex_available: [ "myapex" ],
 		}