Add deprecation notices for Arcnet and FDDI drivers.

We intend to remove support before FreeBSD 12 is branched.

Reviewed by:	imp, emaste
MFC after:	3 days
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D14890

share/man/man4/cm.4

@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 16, 2005
+.Dd March 29, 2018
 .Dt CM 4
 .Os
 .Sh NAME
@@ -46,6 +46,12 @@ module at boot time, place the following line in
 .Bd -literal -offset indent
 if_cm_load="YES"
 .Ed
+.Sh DEPRECATION NOTICE
+The
+.Nm
+driver is not present in
+.Fx 12.0
+and later.
 .Sh DESCRIPTION
 The
 .Nm

share/man/man4/fpa.4

@@ -4,7 +4,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd February 15, 2017
+.Dd March 29, 2018
 .Dt FPA 4
 .Os
 .Sh NAME
@@ -16,6 +16,12 @@
 .Fx
 only:
 .Cd "device fddi"
+.Sh DEPRECATION NOTICE
+The
+.Nm
+driver is not present in
+.Fx 12.0
+and later.
 .Sh DESCRIPTION
 The
 .Nm

sys/dev/cm/if_cm_isa.c

@@ -113,6 +113,7 @@ cm_isa_attach(dev)
 	if (error)
 		goto err;
 
+	gone_in_dev(dev, 12, "cm(4) driver");
 	return 0;
 
 err:

sys/dev/pdq/if_fpa.c

@@ -158,6 +158,7 @@ pdq_pci_attach(device_t dev)
     }
 
 
+    gone_in_dev(dev, 12, "fpa(4) driver");
     return (0);
 bad:
     pdq_free(dev);