Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Let's just use the mib0 partition for our configurations pace. It's
a convenient thing.

tested:

* AP93

Add the missing link back to the EEPROM firmware name.

Hint miibus to attach arswitch on AP91, AP93 and RSPRO boards.

Submitted by: Luiz Otavio O Souza
Approved by: adrian (menthor)

Convert AP93 to use the new AR724X_BASE configuration file.

Now that there's a hint for it, add a "I'm an AR7240 switch!" hint.

Add in the AP93 configuration file.

The AP93 has:

* AR7240 - mips24k processor with integrated 10/100 switch and
various other peripherals;
* AR9283 - 2x2 2.4GHz 802.11n (with calibration data in flash);
* 64MB RAM;
* 16MB SPI flash.

The switch code detects as an AR8216 at the present moment, which isn't
_entirely_ strictly true. However, the MII/MDIO routing in AP93.hints
works - the arge0 MAC connects to PHY4 in the switch, but via the
switch internal MDIO bus. The switch connects to arge0's MDIO bus,
but only to export the switch registers.

Thanks to stb and ray for the switch work, and ray for helping determine
what the correct switch hints should be for this thing.