mediatek: mt8195: add power-off support

mt8195 also uses PMIC mt6359p. The only difference is the
pwrap register definition.

Change-Id: I9962263c46187d1344f14f857bf4b51e33aedda0
diff --git a/plat/mediatek/mt8195/drivers/pmic/pmic.c b/plat/mediatek/mt8195/drivers/pmic/pmic.c
new file mode 100644
index 0000000..cca4413
--- /dev/null
+++ b/plat/mediatek/mt8195/drivers/pmic/pmic.c
@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2020, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <pmic.h>
+#include <pmic_wrap_init.h>
+
+void pmic_power_off(void)
+{
+	pwrap_write(PMIC_PWRHOLD, 0x0);
+}