feat(mediatek): add APU init flow

The patch brings preparation steps before powering on APU
(AI processing unit)

Change-Id: Ica01e035153ec6f3af0de6ba2c66b17a064f8c89
diff --git a/plat/mediatek/drivers/apusys/apusys.h b/plat/mediatek/drivers/apusys/apusys.h
new file mode 100644
index 0000000..5fdd2ec
--- /dev/null
+++ b/plat/mediatek/drivers/apusys/apusys.h
@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2023, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef APUSYS_H
+#define APUSYS_H
+
+#define MODULE_TAG "[APUSYS]"
+
+#endif