staging: wilc1000: wilc_parse_network_info(): renames function variables

This patch renames to avoid camelcase, changes follow are:
 - pu8MsgBuffer to msg_buffer
 - ppstrNetworkInfo to ret_network_info

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