MFC r344479 (by sobomax), r344605:
Modularize xz.

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

Obsolete mkulzma(8) and geom_uncompress(4), their functionality
is now provided by mkuzip(8) and geom_uzip(4) respectively.

MFC after: 1 month

Mark the mostly redundant kernels that just pull
in something from _BASE as NO_UNIVERSE

Differential Revision: https://reviews.freebsd.org/D4200

In kernel config files, it is supposed to be 'options<space><tab>' not
'options<tab><tab>', per long standing (but recently not so strictly
enforced) convention.

Convert to using ulzma.

Remove duplicated GEOM_PART_* options.

PR: 170931
Approved by: adrian

Add switch support to AP96.

Convert AP96 to use the mdioproxy and ARGE_MDIO option.

arge1 still works (it's the standalone PHY) but arge0 and the other switch
ports don't work. They're enumerated though, demonstrating that the
mdiobus abstraction is correctly working.

Flesh out the rest of the AP96 board/config.

* Enable ATH_EEPROM_FIRMWARE, now that it's a compile time option
* Tidy up things a bit.

These are uboot, so mark them as such or booting from flash will not work.

Introduce configuration files for AP94 and AP96.

This uses the new firmware(9) method for squirreling away the EEPROM
contents from SPI flash so ath(4) can get to them later.

It won't work out of the box just yet - you have to add this to
if_ath_pci.c:

#define ATH_EEPROM_FIRMWARE

.. until I've added it as a configuration option and updated things.