phy: phy-rockchip-inno-usb2: add rk3588 support

Add basic support for the USB2 PHY found in the Rockchip RK3588.
Co-developed-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20230522170324.61349-3-sebastian.reichel@collabora.comSigned-off-by: Vinod Koul <vkoul@kernel.org>