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)

- Remove unnecessary register writes in activate_device
and deactivate_device
- Save state before attaching driver and restore it when
detaching
- Clear CLK bit after last bit of byte has been sent over
the bus providing falling edge for last byte in transfer
- Fix several places where CS0 was always assumed
- Add $FreeBSD$ to ar71xxreg.h

Set the svn:eol-style = native and svn:mime-type = text/plain
properties on all files in this tree.

Submitted by: rpaulo@

Place proper svn:keywords tag on all these files. They were created
somehow without them on projects/mips, and that mistake was propigated
over to head.

Submitted by: rpaulo@

Merge from projects/mips to head by hand:

Merge support files for the Atheros AR71xx (and soon AR9xxx)
processors, except files from sys/conf and sys/mips/conf. This work
was done primarily by Olecksandr Tymoshenko and works on the
RouterStation and RouterStation PRO. Other AR71xx-based boards have
been reported as working as well (RouterBoard, for example).

- Add SPI bus driver for ar71xx SoC