usb/ehci: Guard definition of EHCI_DEBUG
Guard against re-definition of EHCI_DEBUG. Allows for turning on of debug info from configure (using --qemu-extra-cflags="-DEHCI_DEBUG=1") rather than source code hacking. Signed-off-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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