Update the 825xx GigE support. Add a large number of new device id's and

Update the 825xx GigE support.  Add a large number of new device id's and
support for the 82541 (e.g. Intel PRO/1000 MT DESKTOP ADAPTER) and 82544.
Also add sysctl support for various interrupt related delay parameters,
and add workarounds for chip issues.

In-Discussion-With: "Peter Avalos" <pavalos@theshell.com>
Submitted-by: Hiten Pandya <hmp@backplane.com>
Adapted-from: FreeBSD-5