remove default memory hotplug setting so that a hb-rf-usb2 can still be connected without enabling usb3
remove default memory hotplug setting so that a hb-rf-usb2 can still be
connected without enabling usb3

jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic