[Bug 243116] Apple hardware with Realtek ALC889A no sound

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243116

            Bug ID: 243116
           Summary: Apple hardware with Realtek ALC889A no sound
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: jwb at freebsd.org

There appear to be several Mac models with this issue.  I found a workaround
using device hints here:

https://forums.freebsd.org/threads/macbook-pro-5-1-realtek-alc889a-sound-setup.56061/


hint.hdaa.0.config="ovref"
hint.hdaa.0.gpio_config="0=set"

For headphone jack autoswitch:

hint.hdaa.0.nid20.config="as=4 seq=15"

Might it be possible to tweak the base to make these models work out of the
box?

I'm familiar with buildkern/buildworld in case either is necessary to test a
fix.

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