staging: wilc1000: rename pstrDelStationMsg in host_int_del_station

This patch renames pstrDelStationMsg to del_sta_info to avoid camelcase.

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