Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

5416 and later parts mux the gpio outputs; extend the api to include
a signal type that's used to select the appropriate mux

add FreeBSD property

import ath hal

virgin import of ath hal