arm64: dts: renesas: r9a09g056: Add USB2.0 support

arm64: dts: renesas: r9a09g056: Add USB2.0 support

The Renesas RZ/V2N (R9A09G056) SoC features a single-channel USB2.0
interface with host and peripheral (function) support.

Add the ECHI, OHCI, USB2.0 PHY and reset control nodes for USB2.0
channel in R9A09G056 SoC DTSI.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250528140453.181851-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>