dt-bindings: usb: Add Aspeed AST2700 DWC3 controller

The Aspeed AST2700 SoC integrates the Synopsys DesignWare USB3 core with
no vendor glue logic: it is functionally compatible with snps,dwc3, uses
the standard DWC3 clocks, and the only SoC-specific part is a USB3 PHY
that is handled by a separate driver.

Add a dedicated binding document rather than adding the compatible and a
conditional to snps,dwc3.yaml. This follows the established per-vendor DWC3
convention (apple,dwc3.yaml, socionext,uniphier-dwc3.yaml, ...) and keeps
the AST2700-specific constraints - notably the mandatory USB3 PHY - out of
the generic schema.

Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260710-xhci-v2-1-f292c4f7339a@aspeedtech.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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