reset: rzg2l-usbphy-ctrl: Add new driver

Add a new driver to control the USB 2.0 PHY reset controller on the
Renesas RZ/G2L and related SoCs.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

include/renesas/rzg2l-usbphy.h

@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * RZ/G2L USB PHY common definitions
+ *
+ * Copyright (C) 2021-2023 Renesas Electronics Corp.
+ */
+
+#ifndef RENESAS_RZG2L_USBPHY_H
+#define RENESAS_RZG2L_USBPHY_H
+
+#include <fdtdec.h>
+
+struct rzg2l_usbphy_ctrl_priv {
+	fdt_addr_t regs;
+};
+
+#endif /* RENESAS_RZG2L_USBPHY_H */