undo gfile setting

Author: mpeddada1

.kokoro/presubmit/graalvm-native-a.cfg

@@ -1,7 +1,5 @@
 # Format: //devtools/kokoro/config/proto/build.proto
 
-gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
-
 build_file: "google-auth-library-java/.kokoro/build.sh"
 
 env_vars: {