staging: wilc1000: tcp_process: add argument dev and use private data

This patch adds 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>