Add audio support for the MediaTek Genio 350-evk

Merge series from Alexandre Mergnat <amergnat@baylibre.com>:

This serie aim to add the following audio support for the Genio 350-evk:
- Playback
  - 2ch Headset Jack (Earphone)
  - 1ch Line-out Jack (Speaker)
  - 8ch HDMI Tx
- Capture
  - 1ch DMIC (On-board Digital Microphone)
  - 1ch AMIC (On-board Analogic Microphone)
  - 1ch Headset Jack (External Analogic Microphone)

Of course, HDMI playback need the MT8365 display patches [1] and a DTS
change documented in "mediatek,mt8365-mt6357.yaml".

Applied patch:
- mfd: mt6397-core: register mt6357 sound codec

Test passed:
- mixer-test log: [3]
- pcm-test log: [4]

[1]: https://lore.kernel.org/all/20231023-display-support-v1-0-5c860ed5c33b@baylibre.com/
[2]: https://lore.kernel.org/all/20240313110147.1267793-1-angelogioacchino.delregno@collabora.com/
[3]: https://pastebin.com/pc43AVrT
[4]: https://pastebin.com/cCtGhDpg
[5]: https://gitlab.baylibre.com/baylibre/mediatek/bsp/linux/-/commits/sound/for-next/add-i350-audio-support