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_input.c

@@ -5,10 +5,7 @@
  *
  */
 
-#include <sys/cdefs.h>
-#include <sys/param.h>
 #include <sys/types.h>
-#include <err.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>