usb: dwc3: improve the config dependency of USB_DWC3_XILINX

A request to Manish Narani (see Link) asked for clarification of the
reference to the config ARCH_VERSAL in the support of Xilinx SoCs with
DesignWare Core USB3 IP.

As there is no response, clean up the reference to the non-existing config
symbol. While at it, follow up on Felipe Balbi's request to add the
alternative COMPILE_TEST dependency.

Link: https://lore.kernel.org/all/CAKXUXMwgWfX8+OvY0aCwRNukencwJERAZzU7p4eOLXQ2zv6rAg@mail.gmail.com/

Signed-off-by: Lukas Bulwahn <[email protected]>
Acked-by: Thinh Nguyen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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