misc: vmm: drop extern crate, use modern rust

This commit is part of a series of similar commits.

Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>
On-behalf-of: SAP philipp.schuster@sap.com

vmm/src/igvm/igvm_loader.rs

@@ -15,6 +15,9 @@ use igvm_defs::{IGVM_VHS_MEMORY_MAP_ENTRY, MemoryMapEntryType};
 use igvm_defs::{
     IGVM_VHS_PARAMETER, IGVM_VHS_PARAMETER_INSERT, IgvmPageDataType, IgvmPlatformType,
 };
+use log::debug;
+#[cfg(feature = "sev_snp")]
+use log::info;
 use mshv_bindings::*;
 use thiserror::Error;
 use zerocopy::IntoBytes;