[autoboot] Use ifconf() to configure network device

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/usr/autoboot.c

 #include <ipxe/timer.h>
 #include <usr/ifmgmt.h>
 #include <usr/route.h>
-#include <usr/dhcpmgmt.h>
 #include <usr/imgmgmt.h>
 #include <usr/prompt.h>
 #include <usr/autoboot.h>
 		goto err_ifopen;
 	ifstat ( netdev );
 
-	/* Configure device via DHCP */
-	if ( ( rc = dhcp ( netdev ) ) != 0 )
+	/* Configure device */
+	if ( ( rc = ifconf ( netdev, NULL ) ) != 0 )
 		goto err_dhcp;
 	route();