phy: renesas: Add Multi-Protocol PHY driver for R-Car X5H

phy: renesas: Add Multi-Protocol PHY driver for R-Car X5H

Add PHY driver for Multi-Protocol PHY present on Renesas R-Car X5H
R8A78000 SoC. Currently, the PHY driver only supports configuring
the MPPHY for ethernet operation.

Signed-off-by: Thanh Quan <thanh.quan.xn@renesas.com>
Signed-off-by: Phong Hoang <phong.hoang.wz@renesas.com>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com> #Fix License-Identifier
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
[Marek: Clean up macros, indent, clock and reset handling in probe,
        rename the driver and add r8a78000- into compatible string,
	update commit message.]