DM: cleanup for header inclusions

used https://gitlab.com/esr/deheader to detect and remove unnecessary
header file inclusions

Signed-off-by: Zide Chen <zide.chen@intel.com>

devicemodel/hw/pci/virtio/virtio.c

@@ -24,11 +24,8 @@
  * SUCH DAMAGE.
  */
 
-#include <sys/cdefs.h>
-#include <sys/param.h>
 #include <sys/uio.h>
 #include <stdio.h>
-#include <stdint.h>
 #include <stddef.h>
 #include <pthread.h>