[nrf noup] zephyr: Start DHCP client only in station mode

DHCP client is needed only when the device is running in
station mode. Check if the SSID is configured in SME structure
which indicates that the given interface is operating
in STA mode.

Signed-off-by: Ravi Dondaputi <ravi.dondaputi@nordicsemi.no>

Author: rado17

src/drivers/driver_zephyr.c

@@ -1525,10 +1525,14 @@ static int wpa_drv_zep_set_supp_port(void *priv,
 				     authorized,
 				     if_ctx->bssid);
 
-#ifdef CONFIG_NET_DHCPV4
-	if (authorized) {
-		net_dhcpv4_restart(iface);
-    }
+#if defined(CONFIG_NET_DHCPV4) && defined(CONFIG_SME)
+	struct wpa_supplicant *wpa_s = if_ctx->supp_if_ctx;
+	/* Need DHCP client in STA mode only */
+	if (wpa_s && wpa_s->sme.ssid_len > 0) {
+		if (authorized) {
+			net_dhcpv4_restart(iface);
+		}
+	}
 #endif
 
 	return ret;