vmm: Move logging output for the debug (0x80) port to info!()

This makes it much easier to use since the info!() level produces far
fewer messages and thus has less overhead.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

vmm/src/vm.rs

@@ -372,7 +372,7 @@ impl VmOps {
     fn log_debug_ioport(&self, code: u8) {
         let elapsed = self.timestamp.elapsed();
 
-        debug!(
+        info!(
             "[{} code 0x{:x}] {}.{:>06} seconds",
             DebugIoPortRange::from_u8(code),
             code,