hyperv: report nested virtualization setting in domain XML

hyperv: report nested virtualization setting in domain XML

When Hyper-V is configured to expose virtualization extensions to a
guest, report this in the domain XML by adding the vendor-appropriate
CPU feature flag:

- Intel hosts: <feature policy='require' name='vmx'/>
- AMD hosts: <feature policy='require' name='svm'/>

This requires adding ExposeVirtualizationExtensions and several other
fields introduced in Windows 10 to the Msvm_ProcessorSettingData WMI
class definition.

Resolves: https://redhat.atlassian.net/browse/RHEL-159129

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>