IFLIB updates:

We found routing performance dropped significantly when configuring
FreeBSD as a router, we are applying the following changes in order to
resolve those issues and hopefully perform better.
 - don't prefetch the flags array, we usually don't need it
 - prefetch the next cache line of each of the software descriptor arrays as
   well as the first cache line of each of the next four packets' mbufs and
   clusters
 - reduce max copy size to 63 bytes
 - convert rx soft descriptors from array of structures to a structure of arrays
 - update copyrights

Submitted by:	Matt Macy <mmacy@nextbsd.org>

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