Just print Android instrument log when the test passes (#5280)

Summary:
This should make it easier to reuse the test spec on Minibench where we don't need to rely on instrument tests to run the benchmark anymore while just keeping it to satisfy AWS as one of its required input.

Pull Request resolved: #5280

Reviewed By: kirklandsign

Differential Revision: D62521107

Pulled By: huydhn

fbshipit-source-id: 08c1ec2ceb4ba2044931267d379a07595304c116

Author: huydhn

examples/demo-apps/android/LlamaDemo/android-llm-device-farm-test-spec.yml

@@ -63,14 +63,7 @@ phases:
         # Check for this last to make sure that there is no failure
         elif [ $TESTS_PASSED -ne 0 ];
         then
-          OBSERVED_TPS=$(grep "INSTRUMENTATION_STATUS: TPS=" $INSTRUMENT_LOG | tail -n 1)
-
-          if [ -n "${OBSERVED_TPS}" ];
-          then
-            echo "[PyTorch] ${OBSERVED_TPS}";
-          else
-            echo "[PyTorch] Test passes but couldn't find the observed TPS from instrument log";
-          fi
+          cat "${INSTRUMENT_LOG}"
         fi;
 
       # Run the new generic benchmark activity https://developer.android.com/tools/adb#am