ath12k: import Atheros/QCA's ath12k driver
This version is based on
https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-testing.git
81e147b1317ee7cde8b624ee8c0501b470d7e91c (wt-2023-08-13)
and was committed to FreeBSD main as
5c1def83a4cc2eb3f828600dfd786f8c5788fb7d.