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

Start enabling the available GPIO pins on the Carambola 2.

The carambola2 exposes all the gpio pins, but some are reserved for
core functions (eg usb, ethernet, etc.) Others are configured by default
to be available as normal GPIO pins to do interesting things with.

GPIO 18->23 is the I2S, SLIC and SPDIF device pins, but none of those
are currently used. So, just allow those to show up.

Tested:

* AR9344, Carambola 2
* (.. bitbang SPI to an Adafruit LCD via libgpio, because FreeBSD could
do with more shiny output devices that aren't network interfaces.)

TODO:

There are some other pins aren't currently included here, but should be.
The LED pins are for the internal switch inside the AR9344.

* GPIO 0+1 are "LED0 + LED1", but they're tied to high for bootstrapping.
* GPIO 13-17 are "LED2..7", but they're tied (H, L, L, L, H) for bootstrapping.
* GPIO 11 and 12 are UART RTS/CTS or I2S; but GPIO 12 is tied L for bootstrap.

Add the MAC address hints for arge0/arge1 on the CARAMBOLA2.

Obtained from: Linux OpenWRT

Migrate these configs to use the geom map search function.

Now that the search function reliably works, this allows for
smaller images.

Add the EEPROM start offset and size in so ath_ahb will use the
supplied EEPROM data.

This needs to die in a fire and replaced with the firmware API
to store the calibration data early ..

Add 8devices CARAMBOLA2 support.

This is based on the AR933x (Hornet) SoC from Qualcomm Atheros.

It's a much nicer board to do development on - 64MB RAM, 16MB flash.
The development board breaks out the GPIO pins, ethernet, serial (via
a USB<->RS232 chip), USB host and of course a small wifi antenna.

Everything but the wifi works thus far.