arm64: dts: mediatek: mt8188: Add audio support

Add following nodes to support audio enablement on MT8188 SoC:
- sound card
- audio controller (AFE)
- audio DSP and its associated mailboxes

Signed-off-by: Fei Shao <fshao@chromium.org>
Link: https://lore.kernel.org/r/20240911143429.850071-8-fshao@chromium.org


Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>