Adds launch security and sets appropiate fields for Intel TDX instances. TDX firmware does not support SMM and conflicts with secure loader. The loader also has to have readonly enabled for TDX, due to a conflict with AppArmor: https://github.com/canonical/tdx/commit/a6216d1eeea8140f9db242d74ebc99c54071535f Partial-Implements: blueprint intel-tdx-libvirt-support Change-Id: Ie38621ac6ce50aa82a7c55da59209f1ece657b25 Signed-off-by: antia <anton.iacobaeus@canarybit.eu>