feat(plat/mediatek/apu): add mt8192 APU device apc driver

Add APU device apc driver and setup permission.

Change-Id: I2bbdb69d11267e4252b2138b5c5ac8faf752740f
diff --git a/plat/mediatek/mt8192/drivers/apusys/mtk_apusys_apc.h b/plat/mediatek/mt8192/drivers/apusys/mtk_apusys_apc.h
new file mode 100644
index 0000000..ff7a9fa
--- /dev/null
+++ b/plat/mediatek/mt8192/drivers/apusys/mtk_apusys_apc.h
@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2021, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __MTK_APUSYS_APC_H__
+#define __MTK_APUSYS_APC_H__
+
+void set_apusys_apc(void);
+
+#endif /* __MTK_APUSYS_APC_H__ */