staging: wilc1000: remove unused parameter of fuction Handle_get_IPAddress

This patch removes parameter pu8IPAddr of fuction Handle_get_IPAddress because
it is not used in the function. Remove argument in the function call also.

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