Thanks unman for your reply!
I have
* switched the VM's kernel to debian 4.9.0-8-amd64
* installed firmware-brcm80211_20180825+dfsg-1_all.deb
* use exactly the same hardware
=> however, the debian in the NetVM is giving me a "SB chip is not supported", 
although I don't see any difference to installing hard on the same machine 
debian 4.9.0-8-amd64 with the same firmware & hardware which works.

However, it works with fedora. I have used before fedora-26 (old qubes), where 
I did not get the brcm4356 running. Now, with fedora-28 executing

sudo dnf install linux-firmware

it works! So for me this issue is done, even though I don't understand why it 
is not possible with debian in qubes.

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