tests: Re-enable test_windows_guest_snapshot_restore

Only for x86-64 for now as it's still failing on ARM64.

See: cloud-hypervisor#4327

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>

Author: rbradford

tests/integration.rs

@@ -9043,7 +9043,7 @@ mod windows {
 
     #[test]
     #[cfg(not(feature = "mshv"))]
-    #[ignore = "See #4327"]
+    #[cfg_attr(target_arch = "aarch64", ignore = "See #4327")]
     fn test_windows_guest_snapshot_restore() {
         let windows_guest = WindowsGuest::new();