Since there is 'hyperv.c' for Hyper-V specific functions already, move
Hyper-V specific functions out of processor.c there.

No functional change intended.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20240816130139.286246-2-vkuznets@redhat.comSigned-off-by: Sean Christopherson <seanjc@google.com>