Add a manual page for the IDT NICStAR driver, and hook it up to the build.

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+.\" $FreeBSD$
+.\"
+.Dd June 3, 2003
+.Dt IDT 4
+.Os
+.Sh NAME
+.Nm idt
+.Nd device driver for IDT NICStAR-based ATM interfaces
+.Sh SYNOPSIS
+.Cd "device idt"
+.Cd "device atm"
+.Sh DESCRIPTION
+The
+.Nm
+device driver supports ATM network interfaces based on the
+IDT NICStAR 77211 controller, including the FORE Systems
+ForeRunner LE25 and LE155.
+For configuring the card for IP see
+.Xr natmip 4 .
+.Pp
+ATM CBR connections are supported, and bandwidth is allocated in
+slots of 64k each.
+Three VBR queues handle traffic for VBR and UBR.
+Two UBR queues prioritize UBR traffic.
+ILMI and signalling get the higher priority queue, as well as UBR traffic
+that specifies a peak cell rate.
+All other UBR traffic goes into the lower queue.
+.Pp
+The following sysctls are recognized by the driver:
+.Bl -tag -width XXX
+.It Cm hw.idt.log_bufstat
+Print statistics about buffer use to the system log periodically.
+.It Cm hw.idt.log_vcs
+Print information about VC opens, closes, and other events to the system log.
+.It Cm hw.idt.bufs_large
+Set or print the maximum size of the 2KB buffer queue.
+.It Cm hw.idt.bufs_small
+Set or print the maximum size of the mbuf queue.
+.It Cm hw.idt.cur_large
+Print the current size of the 2KB buffer queue.
+.It Cm hw.idt.cur_small
+Print the current size of the mbuf queue.
+.It Cm hw.idt.qptr_hold
+Optimize the TX queue buffer for lowest overhead.
+.El
+.Sh SEE ALSO
+.Xr natm 4 ,
+.Xr natmip 4 ,
+.Xr ifconfig 8 ,
+.Xr route 8
+.Sh AUTHORS
+.An Richard Hodges ,
+based on the original driver for
+.Fx 2.2
+by
+.An Mark Tinguely.
+.An Bruce M. Simpson
+wrote this manual page and backported the driver to
+.Fx 4.9 .