pinephone: not using upstream alsa-ucm-conf

The alsa-ucm-conf has been upstreamed here and made it into the 1.2.9. release.

We should use it instead of our custom config in device-pine64-pinephone.

In theory:

remove all ucm related files (ucm directory)
depend on alsa-ucm-conf>=1.2.9
remove replaces="alsa-ucm-conf"

However as I tried to do this for the initial version of !4061 (merged), sound did not work anymore. I'm super busy this week and can't investigate further right now so I'll just add a replaces line to device-pine64-pinephone so sound doesn't break for everybody using edge.

If somebody could help out with figuring out why the upstream config doesn't just work, it would be highly appreciated. It did work six months ago when I tested the PR that upstreamed it.

(When testing, make sure you actually have alsa-ucm-conf >= 1.2.9 installed.)

CC: @PsychoGame, @Arnavion, @BobbyTheBuilder

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