RFE: Allow specifying the virtual machine type

[opoplawski]

Is your feature request related to a problem?

Currently we are seeing an issue where VMs with the q35 machine type on EL9 do not work with SR-IOV, so we need to specify the pc machine type instead. Also, when installing systems using a different architecture than the host you would need to specify the machine type.

Provide a detailed description of the proposed feature

Add to distro, profile and system a virt machine type field.

[SchoolGuy]

Since we have a bunch of virtualization fields already with these types, I have nothing against adding another one. With my refactor this will be improved a bit hopefully however we can move these fields into an object that then can be optionally attached to an object but that is the future. For now let's just add the field to be able to do what you are asking.