staging: wilc1000: rename wilc_connected_SSID variable

This patch renames wilc_connected_SSID variable to wilc_connected_ssid
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>