Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC the altera_atse.4.

This was intended to have been merged along with r256752. This commit
contains the altera_atse.4 portions of r256752, r257656, and r270268.

Approved by: re (gjb)
Sponsored by: DARPA/AFRL

Document MAC address selection and setting for atse(4).

Submitted by: brooks
MFC after: 3 days
Sponsored by: DARPA/AFRL

mdoc: remove EOL whitespace.

MFP4: 221483, 221567, 221568, 221670, 221677, 221678, 221800, 221801,
221804, 221805, 222004, 222006, 222055, 222820, 1135077, 1135118, 1136259

Add atse(4), a driver for the Altera Triple Speed Ethernet MegaCore.

The current driver support gigabit Ethernet speeds only and works with
the MegaCore only in the internal FIFO configuration in the soon to be
open sourced BERI CPU configuration.

Submitted by: bz
MFC after: 3 days
Sponsored by: DARPA/AFRL