spi: mediatek: add ipm design support for MT7986

this patch add the support of ipm design.

Signed-off-by: Leilk Liu <leilk.liu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220315032411.2826-4-leilk.liu@mediatek.com


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