Allow running our test suite on modern AMD CPUs
without it, Tails won't boot.
Tested on
Vendor ID: AuthenticAMD
CPU family: 25
Model: 33
Model name: AMD Ryzen 7 5800X 8-Core Processor
the "fix" is enabled setting LIBVIRT_CPUMODEL: "core2duo"
(or any other cpu model) in features/config/*.yml