staging: wilc1000: rename wilc_enqueue_cmd() to wilc_enqueue_work()

Rename wilc_enqueue_cmd() to wilc_enqueue_work() because its used to
enqueue the work queue. Also removed the function header comment for
wilc_enqueue_cmd() as its not correct.
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>