[vision] Hypervisor: Mention hardware abstraction as goal

In the Hypervisor section of the architecture vision we should mention as one goal to abstract the hardware platform for the VMs (for switching hardware platform and/or hypervisor beneath). The AVPS (https://automotive-virtual-platform-specification.readthedocs.io/en/latest/) would then have details on VirtIO specifications to implement in hypervisors and to consume in operating systems.

This was demonstrated by member Renesas in a TSC or Ref Impl WG session.