ASoC: SOF: mediatek: Use generic implementation for .ipc_msg_data field

Use generic sof_ipc_msg_data instead of specific implementation as
they do the same things

Signed-off-by: Chunxu Li <chunxu.li@mediatek.com>
Link: https://lore.kernel.org/r/20220825065411.31279-4-chunxu.li@mediatek.com


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