iflib: unify prefetchingHEADmain

This change makes all prefetching use the iflib prefetch wrappers, rather
than using prefetch() in some places and __builtin_prefetch() in others.

Note that __builtin_prefetch() does not work in the kernel on amd64 as clang
disables it when -mnosse is specified, so we must use the asm directives there,
and builtin_prefetch() elsewhere.

This change enables prefetching on non-x86 (notably arm64), and it enables
prefetching in netmap that has been there since day one, but which has never worked.

This is a no-op on non-netmap amd64 and i386

Differential Revision: https://reviews.freebsd.org/D60602
Reviewed by: glebius, kbowling
Sponsored by: Netflix

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