staging: r8188eu: Remove wrappers for atomic operations

These wrappers were useful when this driver had the hooks for Windows,
but are no longer needed.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Link: https://lore.kernel.org/r/20210802192721.23110-4-Larry.Finger@lwfinger.net


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