dt-bindings: usb: Document Renesas RZ/G3E USB3HOST

Document the Renesas RZ/G3E USB3.2 Gen2 Host Controller (a.k.a USB3HOST).
The USB3HOST is compliant with the Universal Serial Bus 3.2 Specification
Revision 1.0.
 - Supports 1 downstream USB receptacles
     - Number of SSP Gen2 or SS ports: 1
     - Number of HS or FS or LS ports: 1
 - Supports Super Speed Plus Gen2x1 (10 Gbps), Super Speed (5 Gbps),
   High Speed (480 Mbps), Full Speed (12Mbps), and Low Speed (1.5 Mbps).
 - Supports all transfer-types: Control, Bulk, Interrupt, Isochronous, and
   these split-transactions.
 - Supports Power Control and Over Current Detection.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20250916150255.4231-4-biju.das.jz@bp.renesas.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>