Remove dependency on extern defined constants from OD use case

OD API now takes in these paramaters as part of the constructor

Change-Id: I4cce25e364b2a99847b4540440db059997f6a81b
diff --git a/tests/use_case/object_detection/InferenceTestYoloFastest.cc b/tests/use_case/object_detection/InferenceTestYoloFastest.cc
index eb92904..d328684 100644
--- a/tests/use_case/object_detection/InferenceTestYoloFastest.cc
+++ b/tests/use_case/object_detection/InferenceTestYoloFastest.cc
@@ -104,7 +104,11 @@
         REQUIRE(tflite::GetTensorData<T>(output_arr[i]));
     }
 
-    arm::app::DetectorPostProcess postp{output_arr[0], output_arr[1], results, nRows, nCols};
+    const arm::app::object_detection::PostProcessParams postProcessParams {
+            nRows, nCols, arm::app::object_detection::originalImageSize,
+            arm::app::object_detection::anchor1, arm::app::object_detection::anchor2
+    };
+    arm::app::DetectorPostProcess postp{output_arr[0], output_arr[1], results, postProcessParams};
     postp.DoPostProcess();
 
     std::vector<std::vector<arm::app::object_detection::DetectionResult>> expected_results;