staging: r8188eu: include: Remove unused const definitions

Remove unused const definitions. Issues detected by sparse. Remove the
'#ifdef' and '#endif' preprocessor directives that surround them.

Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Link: https://lore.kernel.org/r/20210802011025.23887-1-fmdefrancesco@gmail.com


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