KVM: selftests: Convert hyperv_features test to using KVM_X86_CPU_FEATURE()

hyperv_features test needs to set certain CPUID bits in Hyper-V feature
leaves but instead of open coding this, common KVM_X86_CPU_FEATURE()
infrastructure can be used.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221013095849.705943-6-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>