bhyve: Remove unneeded include of <machine/iodev.h>

This is a kernel-only header for /dev/io.  The user-facing header
defining the ioctl commands is <dev/io/iodev.h>.

Reviewed by:	bnovkov, imp
Differential Revision:	https://reviews.freebsd.org/D60399

usr.sbin/bhyve/pci_passthru.c

@@ -42,7 +42,6 @@
 
 #include <vm/vm.h>
 
-#include <machine/iodev.h>
 #include <machine/vm.h>
 
 #ifndef WITHOUT_CAPSICUM