Adding correct default value for GuestFeatures

GuestFeatures should default to 0x1 like the kernel does.

Signed-off-by: DGonzalezVillal <Diego.GonzalezVillalobos@amd.com>

src/measurement/vmsa.rs

@@ -135,7 +135,7 @@ bitfield! {
     /// | 15 | SmtProtection |
     /// | 63:16 | Reserved, SBZ |
     #[repr(C)]
-    #[derive(Default, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)]
+    #[derive(Copy, Clone, PartialEq, Eq, Serialize, Deserialize)]
     pub struct GuestFeatures(u64);
     impl Debug;
     /// SNPActive
@@ -174,6 +174,12 @@ bitfield! {
     reserved_3, sbz: 16, 63;
 }
 
+impl Default for GuestFeatures {
+    fn default() -> Self {
+        Self(0x1)
+    }
+}
+
 /// SEV-ES VMSA page
 /// The names of the fields are taken from struct sev_es_work_area in the linux kernel:
 /// https://github.com/AMDESE/linux/blob/sev-snp-v12/arch/x86/include/asm/svm.h#L318