alc: Sync w/ FreeBSD

Mainly
- Fix DMA selection for AR816x family chips.
- Add Killer E2400 support.

Obtained-from: FreeBSD 277907, 295735 (part), 304574, 304584

alc: Fix up MSI configuration

Tested-by: dillon@

kernel - Update if_alc

* Bring in everything FreeBSD has for if_alc. This adds a few more
generations including the one used (for the hardport) by my new
Gigabyte H97N-WIFI mobo.

* Update mii

kernel - Update if_alc

* Bring in everything FreeBSD has for if_alc. This adds a few more
generations including the one used (for the hardport) by my new
Gigabyte H97N-WIFI mobo.

* Update mii as well.

* Disable MSI for now, doesn't seem to work with my test box.

Taken-From: FreeBSD

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kernel: Use the new auto-created sysctl ctx/tree in various drivers.

Everywhere where we formerly rolled a hw.fooX.* per-device ctx/tree
ourselves.

This commit switches it to dev.foo.X.*

alc: Stablize this driver and fix various porting overlooks

- Use ifnet serializer to protect driver data. This should fix the
various panics that were observed on the network output path.
- Fix

alc: Stablize this driver and fix various porting overlooks

- Use ifnet serializer to protect driver data. This should fix the
various panics that were observed on the network output path.
- Fix busdma setup.
- Always allocate the descriptor rings and status blocks at the lower
4GB. The original way will require the RX/TX bufs to be located at
the lower 4GB, which is a great waste of bounce buffers, cpu cycles
and memory bandwidth.
- Don't mess up M_PKTHDR on RX path.
- Allocate mbuf w/ MB_WAIT on initialization path.
- Enable MSI by default.

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Remove empty DragonFly CVS IDs.

kernel - Bring if_alc up to FreeBSD rev 1.16

* Bring in all recent if_alc work from FreeBSD.

Taken-from: FreeBSD

netif - alc driver port - Initial work by Samuel J. Greear

Submitted-by: "Samuel J. Greear" <sjg@evilcode.net>
Taken-From: FreeBSD