arm64: dts: renesas: r8a774a1: Add USB2.0 phy and host(EHCI/OHCI) device nodes

Add USB2.0 phy and host (EHCI/OHCI) device nodes on RZ/G2M SoC dtsi.

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>