udbc: Add usb debug host mode driverxhci offers a debugging interface which uses a special usb 3 cable with the D+,D- and VBUS pairs disconnected. This interface allows a target device toconfigur
udbc: Add usb debug host mode driverxhci offers a debugging interface which uses a special usb 3 cable with the D+,D- and VBUS pairs disconnected. This interface allows a target device toconfigure its xhci controller as a debugging channel which can then be used toprovide a serial link between the target and a debug host.This change extracts the udbc host mode driver from hrs@'s xhci debugimplementation.Reviewed by: bcr (man page)MFC after: Before 15-ALPHA3 buildsSponsored by: The FreeBSD FoundationDifferential Revision: https://reviews.freebsd.org/D51299
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