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Enable CONFIG_USB_XHCI_DBGCAP

Ryszard Knop requested to merge dragoonaethis/linux:main into main

Allows enabling the xHCI debug port interface, documented here: https://docs.kernel.org/driver-api/usb/usb3-debug-port.html

This does not change the default behavior, but allows enabling early printk, serial over USB and remote debug on the USB controller in /sys/bus/pci/devices/<xHCI address>/dbc.

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