staging: wilc1000: wilc_wlan_handle_txq: add argument and use wilc

This patch adds argument net_device dev and use netdev private data memeber
wilc instead of g_linux_wlan.

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