staging: r8188eu: remove unused rtw_private_args entries

Remove the entries of the rtw_private_args array that refer to
non-existing private ioctls.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211226212535.197989-2-martin@kaiser.cx


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