staging: wilc1000: wlan_deinit_locks: change argument wilc with net_device

This patch changes argument wilc with net_device and use netdev private data
member wilc instead of g_linux_wlan.

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