arm64: dts: mediatek: Remove asurada-audio dtsi files

arm64: dts: mediatek: Remove asurada-audio dtsi files

There aren't enough users of the common asurada-audio dtsi files to
justify having them. It is simpler to just have the audio nodes directly
on the board files.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230721201705.387426-4-nfraprado@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>