KVM: nVMX: Fix up VM_ENTRY_IA32E_MODE control feature reporting

Do not report that we can enter the guest in 64-bit mode if the host is
32-bit only. This is not supported by KVM.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>