google-cloud: Print "kvm" fact on aarch64 instances

google-cloud: Print "kvm" fact on aarch64 instances

GCE instances are KVM with a non-QEMU userspace.  On x86-64 we should
recognize this from the CPUID information, but aarch64 has no
equivalent to this.  /proc/device-tree/hypervisor/compatible contains
something but RHEL does not use device tree.  However the SMBIOS
tables exported by GCE do contain:

  Manufacturer: KVM

so we can use that.

  # uname -m
  aarch64
  # virt-what
  google_cloud
  kvm

This commit also updates the test.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2114997
Updates: commit 54b726fa7c9687b692162488e8934a426f9fa6c3
Thanks: Eric Auger, Yongkui Guo