ath11k: import Atheros/QCA's ath11k driver
This version is based on
https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/log/?h=master
6bae9de622d3ef4805aba40e763eb4b0975c4f6d
and was committed to FreeBSD main as
dd4f32ae62426a10a84b4322756d82c06c202c4e.