Create two more usb device nodes by default, as modern Apple hardware

(among others) attaches *eight* uhub devices.
From remco at d-compu, dyndns org; ok deraadt@

src/etc/MAKEDEV.common

@@ -1,4 +1,4 @@
-vers(a, {-$OpenBSD: MAKEDEV.common,v 1.50 2010/07/23 14:35:56 mglocker Exp $-})dnl
+vers(a, {-$OpenBSD: MAKEDEV.common,v 1.51 2010/08/03 20:12:01 miod Exp $-})dnl
 dnl
 dnl Copyright (c) 2001-2006 Todd T. Fries <todd@OpenBSD.org>
 dnl
@@ -188,7 +188,7 @@ dnl
 dnl XXX some arches use ramd, others ramdisk - needs to be fixed eventually
 __devitem(ramdisk, ramdisk, Ramdisk kernel devices,nothing)dnl
 dnl
-target(usb, usb, 0, 1, 2, 3, 4, 5)dnl
+target(usb, usb, 0, 1, 2, 3, 4, 5, 6, 7)dnl
 target(usb, urio, 0)dnl
 twrget(usb, uscan, uscanner, 0)dnl
 target(usb, uhid, 0, 1, 2, 3)dnl