staging: r8188eu: remove unused constant CRC32_POLY

Remove unused constant CRC32_POLY.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210903190444.15585-2-straube.linux@gmail.com


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