misc: Automatically fix cargo clippy issues added in 1.65 (stable)

The code of the stable branch diverges from the main branch, so we
can't directly backport the corresponding commit to fix the clippy
issues.

See: commit 5e52729453

Signed-off-by: Bo Chen <chen.bo@intel.com>

hypervisor/src/arch/emulator/mod.rs

@@ -24,10 +24,10 @@ impl<T: Debug> Display for Exception<T> {
             self.vector,
             self.ip,
             self.error
-                .map(|e| format!(": error {:x}", e))
+                .map(|e| format!(": error {e:x}"))
                 .unwrap_or_else(|| "".to_owned()),
             self.payload
-                .map(|payload| format!(": payload {:x}", payload))
+                .map(|payload| format!(": payload {payload:x}"))
                 .unwrap_or_else(|| "".to_owned())
         )
     }

hypervisor/src/kvm/aarch64/mod.rs

@@ -97,8 +97,7 @@ pub fn is_system_register(regid: u64) -> bool {
 
     assert!(
         !(size != KVM_REG_SIZE_U32 && size != KVM_REG_SIZE_U64),
-        "Unexpected register size for system register {}",
-        size
+        "Unexpected register size for system register {size}"
     );
 
     true