4.19/rpi4: enable kvm and disable some unneeded stuff
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Closes https://git.helsinki.tools/helsinki-systems/helsinki/-/issues/135
[ 1.163460] kvm [1]: 8-bit VMID
[ 1.164183] kvm [1]: vgic interrupt IRQ1
[ 1.164372] kvm [1]: Hyp mode initialized successfullynixos/tests/simple.nix baut auch.