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When querying whether or not eVMCS is enabled on behalf of the guest,
treat eVMCS as enable if and only if Hyper-V is enabled/exposed to the
guest.

Note, flows that come from the host, e.g. KVM_SET_NESTED_STATE, must NOT
check for Hyper-V being enabled as KVM doesn't require guest CPUID to be
set before most ioctls().
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220830133737.1539624-7-vkuznets@redhat.com

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>