hypervisor: Move msr and msr_data macro to arch/x86

Currently these two macros(msr, msr_data) reside both on kvm and mshv
module. Definition is same for both module. Moving them to arch/x86
module eliminates redundancy and makes more sense.

Signed-off-by: Muminul Islam <muislam@microsoft.com>

hypervisor/src/mshv/x86_64/mod.rs

@@ -49,15 +49,6 @@ pub enum IoEventAddress {
     /// Representation of an memory mapped I/O address.
     Mmio(u64),
 }
-macro_rules! msr {
-    ($msr:expr) => {
-        MsrEntry {
-            index: $msr,
-            data: 0x0,
-            ..Default::default()
-        }
-    };
-}
 
 impl SegmentRegisterOps for SegmentRegister {
     fn segment_type(&self) -> u8 {