Apply workaround to allow for bridging between the two ethrnet ports on VF2

Created by: leon332157

When trying to use NetworkManager to bridge the two ethernet ports on VF2 on current kernel, there is an error Adding VLAN in promisc mode not supported message in the journal. So I applied this workaround from armbian, which successfully allowed me to bridge the two ethernet ports as shown here.

I submitted a PR to add it to the archlinux image kernel, but adding this to this upstream kernel would be helpful, so that newer versions of the build will continue to work, until the upstream process is complete and later versions of the kernel can be used.