Add support for int32 in inference_runner

Change-Id: Ic4605a22547ab797c638bfddd9719c69d495da75
diff --git a/driver_library/src/ethosu.cpp b/driver_library/src/ethosu.cpp
index 4fc431b..29cb77e 100644
--- a/driver_library/src/ethosu.cpp
+++ b/driver_library/src/ethosu.cpp
@@ -116,6 +116,7 @@
         return 1;
     case tflite::TensorType::TensorType_INT16:
         return 2;
+    case tflite::TensorType::TensorType_INT32:
     case tflite::TensorType::TensorType_FLOAT32:
         return 4;
     default: