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mt8186 DSP uses two hardware mailbox IP to communicate with AP. One mailbox is used for requests coming from AP, and the other one is for requests from DSP. Signed-off-by: Allen-KH Cheng <Allen-KH.Cheng@mediatek.com> Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com> Link: https://lore.kernel.org/r/20220512082215.3018-4-tinghan.shen@mediatek.com Signed-off-by: Mark Brown <broonie@kernel.org>