staging: wilc1000: rename pstrDelAllStationMsg in wilc_del_allstation

This patch renames pstrDelAllStationMsg to del_all_sta_info to avoid
camelcase.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>