staging: wilc1000: use wilc instead of wilc_dev and remove wilc_dev

This patch changes wilc_dev with wilc in the function call
wilc_wlan_get_num_conn_ifcs, and remove wilc_dev and it's related codes.

Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>