Add LOCAL_UNINSTALLABLE_MODULE: true to test_package AndroidMkEntries

This change should prevent the output zip from being
installed to system/etc

Test: CI and check the output
Bug: 388850000
Change-Id: Iff6c27d5d206428432e6a3d893b1a82f990d79f9
diff --git a/ci_tests/ci_test_package_zip.go b/ci_tests/ci_test_package_zip.go
index 95249aa..d7aaa66 100644
--- a/ci_tests/ci_test_package_zip.go
+++ b/ci_tests/ci_test_package_zip.go
@@ -284,6 +284,10 @@
 		android.AndroidMkEntries{
 			Class:      "ETC",
 			OutputFile: android.OptionalPathForPath(p.output),
+			ExtraEntries: []android.AndroidMkExtraEntriesFunc{
+				func(ctx android.AndroidMkExtraEntriesContext, entries *android.AndroidMkEntries) {
+					entries.SetBool("LOCAL_UNINSTALLABLE_MODULE", true)
+				}},
 		},
 	}
 }