pci-assign: do not include sys/io.h

This file does not exist on bionic libc and the functions it defines
are in fact not used by pci-assign.c.  Remove it.
Reported-by: NHoucheng Lin <houcheng@gmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

hw/i386/kvm/pci-assign.c

@@ -22,7 +22,6 @@
  */
 #include <stdio.h>
 #include <unistd.h>
-#include <sys/io.h>
 #include <sys/mman.h>
 #include <sys/types.h>
 #include <sys/stat.h>