staging: wilc1000: remove useless function

This patch remove useless function remove_TCP_related
in wilc_wlan.c file

Signed-off-by: Chris Park <chris.park@atmel.com>
Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>