bcm2708: prevent wpad-mini from conflicting with hostapd-mini (#1065)

targets/brcm2708-bcm2708

@@ -1,3 +1,4 @@
 device raspberry-pi rpi
 factory -ext4-sdcard .img.gz
 sysupgrade -ext4-sdcard .img.gz
+packages '-wpad-mini' # clashes with hostapd-mini