Use preset test spec

Author: huydhn

.github/workflows/android.yml

@@ -102,7 +102,7 @@ jobs:
       android-app-archive: https://gha-artifacts.s3.amazonaws.com/${{ github.repository }}/${{ github.run_id }}/artifact/app-debug.apk
       android-test-archive: https://gha-artifacts.s3.amazonaws.com/${{ github.repository }}/${{ github.run_id }}/artifact/app-debug-androidTest.apk
       # The test spec can be downloaded from https://ossci-assets.s3.amazonaws.com/android-llama2-device-farm-test-spec.yml
-      test-spec: https://ossci-assets.s3.amazonaws.com/android-llama2-device-farm-test-spec.yml
+      test-spec: arn:aws:devicefarm:us-west-2:308535385114:upload:02a2cf0f-6d9b-45ee-ba1a-a086587469e6/8dfb4601-ea67-4f45-bdad-51af3c5e8a44
       # The exported llama2 model and its tokenizer, can be downloaded from https://ossci-assets.s3.amazonaws.com/executorch-android-llama2-7b.zip.
       # Among the input, this is the biggest file and uploading it to AWS beforehand makes the test run much faster
       extra-data: arn:aws:devicefarm:us-west-2:308535385114:upload:02a2cf0f-6d9b-45ee-ba1a-a086587469e6/bd15825b-ddab-4e47-9fef-a9c8935778dd