Initialize platform for MediaTek MT8195

- Add basic platform setup
- Add MT8195 documentation at docs/plat/
- Add generic CPU helper functions
- Add basic register address

Change-Id: I7978e2f32e58900e5cf93f741ee8eaf8b8e3b842
Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
diff --git a/plat/mediatek/mt8195/plat_pm.c b/plat/mediatek/mt8195/plat_pm.c
new file mode 100644
index 0000000..61d2cc9
--- /dev/null
+++ b/plat/mediatek/mt8195/plat_pm.c
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2021, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <lib/psci/psci.h>
+
+static const plat_psci_ops_t plat_psci_ops = {
+};
+
+int plat_setup_psci_ops(uintptr_t sec_entrypoint,
+			const plat_psci_ops_t **psci_ops)
+{
+	*psci_ops = &plat_psci_ops;
+
+	return 0;
+}