Atheros spdif support

From: Mori Hiroki <yamori813_at_yahoo.co.jp>
Date: Tue, 02 May 2023 10:34:48 UTC
Hi

My 12-Stable forked branch have atheros pcm driver.
That is also support SPDIF.

https://github.com/ZRouter/freebsd-src/tree/zrouter_yamori813

AR934x have GPIO pin mux. I use it.

I seem FreeBSD pcm framework not work on 24k but work 74k.

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Hiroki Mori