Add kernel support for the TP-LINK MR3020 Atheros MIPS 24k router.

AR9331 based system.

Phabric:	https://reviews.freebsd.org/D780
Reviewed by:	adrian


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272206 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Switch primes(6) from using unsigned long to using uint64_t.  This fixes
'limited range of type' warnings about comparisons on 32-bit systems, and
allows 32-bit systems to compute the full range of primes.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272207 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f