wifi: rtw88: use cfg80211_ssid_eq() instead of rtw_ssid_equal()

Prefer generic 'cfg80211_ssid_eq()' over dropped 'rtw_ssid_equal()'.
Compile tested only.

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Link: https://msgid.link/20231215123859.196350-3-dmantipov@yandex.ru


Signed-off-by: Johannes Berg <johannes.berg@intel.com>