KVM: x86/pmu: Add kvm_pmu_call() to simplify static calls of kvm_pmu_ops

Similar to kvm_x86_call(), kvm_pmu_call() is added to streamline the usage
of static calls of kvm_pmu_ops, which improves code readability.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Link: https://lore.kernel.org/r/20240507133103.15052-4-wei.w.wang@intel.com


Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>