vmm: Refactor VM creation workflow

This refactoring is required to add support for creating SEV-SNP enabled
VM.

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>

vmm/src/lib.rs

@@ -1312,6 +1312,8 @@ impl Vmm {
             &self.hypervisor,
             #[cfg(feature = "tdx")]
             false,
+            #[cfg(feature = "sev_snp")]
+            false,
         )
         .map_err(|e| {
             MigratableError::MigrateReceive(anyhow!(