staging: r8188eu: we always enqueue in rtw_set_chplan_cmd

The only caller of rtw_set_chplan_cmd requests that the message be
enqueued and not sent directly.

Remove the enqueue parameter and the code for direct sending.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220108124959.313215-13-martin@kaiser.cx


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