Exporting define for layer by layer profiler

Libraries that link the layer_by_layer_profiler interface library will
also get the LAYER_BY_LAYER_PROFILE define appending to the build
arguments. This allows the preprocessor to select which profiler to use.

Change-Id: I85fec66d2dd9949fd7fe395fb44e49bda1539925
diff --git a/applications/inference_process/src/inference_process.cpp b/applications/inference_process/src/inference_process.cpp
index 2a0b687..09439f8 100644
--- a/applications/inference_process/src/inference_process.cpp
+++ b/applications/inference_process/src/inference_process.cpp
@@ -24,7 +24,7 @@
 #include "tensorflow/lite/schema/schema_generated.h"
 
 #include "arm_profiler.hpp"
-#ifdef ETHOSU
+#ifdef LAYER_BY_LAYER_PROFILER
 #include "layer_by_layer_profiler.hpp"
 #endif
 #include "ethosu_log.h"
@@ -204,7 +204,7 @@
 
     // Create the TFL micro interpreter
     tflite::AllOpsResolver resolver;
-#ifdef ETHOSU
+#ifdef LAYER_BY_LAYER_PROFILER
     tflite::LayerByLayerProfiler profiler;
 #else
     tflite::ArmProfiler profiler;