Do not clear global pmf setting on FLUSH

This parameter was actually used in some testing cases in a way that did
not really work well with the FLUSH command ending up disabling PMF.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

wpa_supplicant/ctrl_iface.c

@@ -5454,7 +5454,6 @@ static void wpa_supplicant_ctrl_iface_flush(struct wpa_supplicant *wpa_s)
 	wpa_config_flush_blobs(wpa_s->conf);
 	wpa_s->conf->auto_interworking = 0;
 	wpa_s->conf->okc = 0;
-	wpa_s->conf->pmf = 0;
 
 	wpa_sm_set_param(wpa_s->wpa, RSNA_PMK_LIFETIME, 43200);
 	wpa_sm_set_param(wpa_s->wpa, RSNA_PMK_REAUTH_THRESHOLD, 70);