[CFT] em(4) - Update to use Extended RX Descriptor Format

[Sean Bruno]

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https://reviews.freebsd.org/D3447

I'm looking for a bunch of you folks who have em(4) and *not* lem(4)
to test out this update.  This matches what linux does in e1000e vs
e1000 and should be a no-op for your machines.  The more devices we
test here the better.

sean
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