staging: wilc1000: deinit_irq: use wilc instead of g_linux_wlan

This patch changes function parameter linux_wlan_t nic with net_dev dev and
use netdev private data member wilc instead of nic and g_linux_wlan.

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