Remove ETHOSU define from targets

Ethos-U core driver exports the macro

Change-Id: I373dbdaa9ec0ee24d566912fc876a4a0627e8b63
diff --git a/targets/demo/CMakeLists.txt b/targets/demo/CMakeLists.txt
index a1ba620..1bb97cc 100644
--- a/targets/demo/CMakeLists.txt
+++ b/targets/demo/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2022 Arm Limited.
+# SPDX-FileCopyrightText: Copyright 2022-2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
 #
 # SPDX-License-Identifier: Apache-2.0
 #
@@ -111,8 +111,6 @@
 
 if (TARGET ethosu_core_driver)
     target_compile_definitions(ethosu_core_driver PUBLIC
-        ETHOSU
-
         # The TFLM arena is accessed over base address 1. The region config
         # controls if the memory transactions are routed over AXI 0 (region config
         # 0 or 1) or AXI 1 (region config 2 or 3).