wifi: mwifiex: use cfg80211_ssid_eq() instead of mwifiex_ssid_cmp()

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

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Link: https://msgid.link/20231215123859.196350-2-dmantipov@yandex.ru


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