[CFT] em(4) updates

[Sean Bruno]

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Intel and Limelight have collaborated a bit to update em(4) and shake
loose some features.

https://svnweb.freebsd.org/changeset/base/283959

I've left EM_MULTIQUEUE turned off by default but some of the changes in
head are relevant to all em(4) chipsets.

lem(4) is unaffected by this change.

If you've had issues with em(4) in the past or have problems now, I'd
really appreciate a shake down of these changes.

sean
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