Remove ETHOSU define from targets

Ethos-U core driver exports the macro

Change-Id: I373dbdaa9ec0ee24d566912fc876a4a0627e8b63
diff --git a/targets/corstone-300/CMakeLists.txt b/targets/corstone-300/CMakeLists.txt
index b76c474..dfa2792 100644
--- a/targets/corstone-300/CMakeLists.txt
+++ b/targets/corstone-300/CMakeLists.txt
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2020-2022 Arm Limited. All rights reserved.
+# SPDX-FileCopyrightText: Copyright 2020-2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
 #
 # SPDX-License-Identifier: Apache-2.0
 #
@@ -127,11 +127,6 @@
     ethosu_mhu_dummy
     ethosu_uart_cmsdk_apb)
 
-if (TARGET ethosu_core_driver)
-    target_compile_definitions(ethosu_core_driver PUBLIC
-        ETHOSU)
-endif()
-
 if (TARGET event_recorder)
     target_include_directories(event_recorder BEFORE INTERFACE
         event_recorder)