Include realtek in wifi drivers

src/freedombone-image-customise

 
         # install proprietary wifi drivers
         # see https://wiki.debian.org/iwlwifi
-        chroot "$rootdir" apt-get -yq install firmware-iwlwifi firmware-b43-installer firmware-brcm80211
+        chroot "$rootdir" apt-get -yq install firmware-iwlwifi firmware-b43-installer firmware-brcm80211 firmware-realtek
     fi
 
     INSTALLING_MESH=1