raspberry pi 4: factory.cfg: Add presence container wifi

This to work as intended now when #1082 is fixed.

Default setting: Scan on wifi interface

Author: mattiaswal

src/board/raspberry-pi-4/rootfs/usr/share/product/raspberrypi,4-model-b/etc/factory-config.cfg

@@ -41,7 +41,8 @@
       },
       {
         "name": "wifi0",
-        "type": "infix-if-type:wifi"
+        "type": "infix-if-type:wifi",
+	"infix-interfaces:wifi": {}
       }
     ]
   },