KVM: x86: Introduce helper to handle Hyper-V paravirt TLB flush requests

As a preparation to making Hyper-V emulation optional, introduce a helper
to handle pending KVM_REQ_HV_TLB_FLUSH requests.

No functional change intended.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Tested-by: Jeremi Piotrowski <jpiotrowski@linux.microsoft.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20231205103630.1391318-8-vkuznets@redhat.com


Signed-off-by: Sean Christopherson <seanjc@google.com>