staging: wilc1000: Set_machw_change_vir_if: add argument struct net_device

Add new argument net_device and use netdev private data member wilc
instead of g_linux_wlan. Pass argument dev to the function as well.

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