staging: wilc1000: match argument name of wilc_add_rx_gtk declaration

Some argument name of wilc_add_rx_gtk declaration is different to those
of this function definition. It is changed as same name of this function
declaration and definition.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>