dt-bindings: Add vendor prefix for arcx / Archronix
arcx Inc. is an engineering company which provides advanced
embedded systems and consulting services.
Archronix is a technology design and product engineering firm
specializing in hardware control systems and enabling software.
Clients include OEM's in the transportation, aerospace,
medical and commercial sectors.
Reviewed-by: Rob Herring <robh@kernel.org> Reviewed-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>