ASoC: dt-bindings: mediatek,mt8188-afe: add memory-region

Add memory-region property to utilize the reserved memory region.

Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230629074348.21670-3-trevor.wu@mediatek.com


Signed-off-by: Mark Brown <broonie@kernel.org>