staging: wilc1000: rename pstrNetworkInfo in get_rssi_avg function

This patch renames pstrNetworkInfo to network_info that is
first argument of get_rssi_avg function to avoid camelcase.

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>