broadcom-wl: add interface after bridge is up

Without this patch adding the wifi device to the bridge may fail
because the bridge is not already configured when the wifi device gets
configured. This patch makes broadcom-wl wait till the bridge is ready.

This fixes #17262

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 46749

package/kernel/broadcom-wl/files/lib/wifi/broadcom.sh

@@ -377,6 +377,7 @@ enable_broadcom() {
 
 		local net_cfg="$(find_net_config "$vif")"
 		[ -z "$net_cfg" ] || {
+			ubus -t 30 wait_for network.interface."$net_cfg"
 			append if_up "set_wifi_up '$vif' '$ifname'" ";$N"
 			append if_up "start_net '$ifname' '$net_cfg'" ";$N"
 		}