mediatek: mt8192: add pmic mt6359p driver

add pmic mt6359p driver

Change-Id: I20f2218f7d2087e8d2bf31258cf92a02e0dab77d
diff --git a/plat/mediatek/mt8192/drivers/pmic/pmic.h b/plat/mediatek/mt8192/drivers/pmic/pmic.h
new file mode 100644
index 0000000..aac22af
--- /dev/null
+++ b/plat/mediatek/mt8192/drivers/pmic/pmic.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2020, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef PMIC_H
+#define PMIC_H
+
+#define PMIC_PWRHOLD 0xa08
+
+/* external API */
+void pmic_power_off(void);
+
+#endif /* PMIC_H */