hostapd: allow adding initial AP without breaking STA interface connection

When switching from a STA-only configuration to AP+STA on the same phy, the
STA was previously restarted in order to notify hostapd of the new frequency,
which might not match the AP configuration.
Fix the STA restart by querying the operating frequency from within hostapd
when bringing up the AP.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh

@@ -889,7 +889,6 @@ wpa_supplicant_init_config() {
 wpa_supplicant_add_interface() {
 	local ifname="$1"
 	local mode="$2"
-	local hostapd_ctrl="$3"
 	local prev
 
 	_wpa_supplicant_common "$ifname"
@@ -903,7 +902,6 @@ wpa_supplicant_add_interface() {
 	json_add_string config "$_config"
 	json_add_string macaddr "$macaddr"
 	[ -n "$network_bridge" ] && json_add_string bridge "$network_bridge"
-	[ -n "$hostapd_ctrl" ] && json_add_string hostapd_ctrl "$hostapd_ctrl"
 	[ -n "$wds" ] && json_add_boolean 4addr "$wds"
 	json_add_boolean powersave "$powersave"
 	[ "$mode" = "mesh" ] && mac80211_add_mesh_params
@@ -978,7 +976,7 @@ mac80211_setup_supplicant() {
 		wpa_supplicant_add_network "$ifname" "$freq" "$htmode" "$noscan"
 	fi
 
-	wpa_supplicant_add_interface "$ifname" "$mode" "$hostapd_ctrl"
+	wpa_supplicant_add_interface "$ifname" "$mode"
 
 	return 0
 }