tdx: Update support based on kvm-upstream v5.19

In order to comply with latest TDX version, we rely onto the branch
kvm-upstream-2022.08.07-v5.19-rc8 from https://github.com/intel/tdx
repository. Updates are based on changes that happened in
arch/x86/include/uapi/asm/kvm.h headers file.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

vmm/src/vm.rs

@@ -833,13 +833,11 @@ impl Vm {
     ) -> Result<Arc<dyn hypervisor::Vm>> {
         hypervisor.check_required_extensions().unwrap();
 
+        // 0 for KVM_X86_LEGACY_VM
+        // 1 for KVM_X86_TDX_VM
         #[cfg(feature = "tdx")]
         let vm = hypervisor
-            .create_vm_with_type(if tdx_enabled {
-                2 // KVM_X86_TDX_VM
-            } else {
-                0 // KVM_X86_LEGACY_VM
-            })
+            .create_vm_with_type(u64::from(tdx_enabled))
             .unwrap();
         #[cfg(not(feature = "tdx"))]
         let vm = hypervisor.create_vm().unwrap();