staging: wilc1000: linux_wlan_get_firmware: change argument p_nic with dev

This patch changes argument perInterface_wlan_t *p_nic with struct net_device
*dev and use netdev private data nic and it's 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>