Add deprecation notice to vpo.4

This driver has seen no real changes for almost 20 years. It's for
hardware that's 25 years old. It has no reports of active use, nor
has it been seen in the NYCBug dmesg database at all. Schedule
its removal for 13.0.

Reviewed by: rgrimes@ (earlier version)
Relnote: Yes
MFC After: 3 days
Differential Revision: https://reviews.freebsd.org/D23403

share/man/man4/vpo.4

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd December 14, 2004
+.Dd December 21, 2019
 .Dt VPO 4
 .Os
 .Sh NAME
@@ -39,6 +39,12 @@ For one or more SCSI busses:
 The
 .Nm
 driver provide access to parallel port Iomega Zip and Jaz drives.
+.Sh DEPRECATED
+The
+.Nm
+driver is now deprecated.
+It will be removed in
+.Fx 13.0 .
 .Sh HARDWARE
 The
 .Nm

sys/dev/ppbus/vpo.c

@@ -126,6 +126,7 @@ vpo_probe(device_t dev)
 		return (error);
 	}
 	ppb_unlock(ppbus);
+	gone_in_dev(dev, 13, "Hardware no longer relevant");
 
 	return (0);
 }