WIP port of the Linux ath11k driver

Contributed by rueda on 2023-12-29 from the ACK the ath, qwx! dept.

Stefan Sperling (stsp@) has committed to -current a WIP driver for Qualcomm ath11k wi-fi adapters (such as that found in the Lenovo ThinkPad X13s):

CVSROOT:	/cvs
Module name:	src
Changes by:	stsp@cvs.openbsd.org	2023/12/28 10:36:29

Modified files:
	sys/arch/amd64/conf: GENERIC RAMDISK_CD 
	sys/arch/arm64/conf: GENERIC RAMDISK 
	sys/conf       : files 
	sys/dev/pci    : files.pci 
Added files:
	sys/dev/ic     : qwx.c qwxreg.h qwxvar.h 
	sys/dev/pci    : if_qwx_pci.c 

Log message:
Introduce qwx(4), a work-in-progress port of the Linux ath11k driver.

This driver is not working yet. Scanning almost works but a lot more
work remains to be done. So far most of the porting work was done by
myself, with some help from mpi, patrick, and kettenis.

Obviously this driver remains disabled for now. Enable relevant lines
in the kernel config if you want to help out with development.

At present firmware files must be obtained manually and placed
in the directory /etc/firmware/qwx/WCN6855/hw2.1/
This will be improved later.

Thanks to the OpenBSD Foundation for supporting this effort.

So summing up, thanks to support from the OpenBSD Foundation, work on support for this popular hardware has started, and is progressing towards useable status.

It's not quite there yet, but this being early in the cycle, there is reason to hope for official support status by the time of the upcoming release.

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