staging: r8188eu: remove remaining DBG_88E call from include/usb_ops.h

Remove the one remaining DBG_88E call from include/usb_ops.h. After
some thought, it makes more sense to just entirely strip all of these
calls, so that debugging code in the driver can be more consistent and
useful going forwards.

Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20220216010709.791-9-phil@philpotter.co.uk


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>