KVM: x86: Pass reference pvclock as a param to kvm_setup_guest_pvclock()

Pass the reference pvclock structure that's used to setup each individual
pvclock as a parameter to kvm_setup_guest_pvclock() as a preparatory step
toward removing kvm_vcpu_arch.hv_clock.

No functional change intended.

Reviewed-by: Paul Durrant <paul@xen.org>
Link: https://lore.kernel.org/r/20250201013827.680235-9-seanjc@google.com


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