arm64: dts: mediatek: cherry: Add Audio Front End (AFE) support

In preparation for adding audio support, enable the AFE HW with
the appropriate eTDM configuration and memory region.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220922094908.41623-2-angelogioacchino.delregno@collabora.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>