hypervisor: Add an API to create default StandardRegisters

This will be used to create StandardRegisters for a given vcpu in
future.

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

hypervisor/src/cpu.rs

@@ -321,6 +321,12 @@ pub type Result<T> = anyhow::Result<T, HypervisorCpuError>;
 /// Trait to represent a generic Vcpu
 ///
 pub trait Vcpu: Send + Sync {
+    ///
+    /// Returns StandardRegisters with default value set
+    ///
+    fn create_standard_regs(&self) -> StandardRegisters {
+        unimplemented!();
+    }
     ///
     /// Returns the vCPU general purpose registers.
     ///