hypervisor, vmm: move away from CpuId type

CpuId is an alias type for the flexible array structure type over
CpuIdEntry. The type itself and the type of the element in the array
portion are tied to the underlying hypervisor.

Switch to using CpuIdEntry slice or vector directly. The construction of
CpuId type is left to hypervisors.

This allows us to decouple CpuIdEntry from hypervisors more easily.

No functional change intended.

Signed-off-by: Wei Liu <liuwe@microsoft.com>

hypervisor/src/kvm/x86_64/mod.rs

@@ -52,7 +52,7 @@ pub fn check_required_kvm_extensions(kvm: &Kvm) -> KvmResult<()> {
 }
 #[derive(Clone, Serialize, Deserialize)]
 pub struct VcpuKvmState {
-    pub cpuid: CpuId,
+    pub cpuid: Vec<CpuIdEntry>,
     pub msrs: MsrEntries,
     pub vcpu_events: VcpuEvents,
     pub regs: kvm_regs,