dt-bindings: mmc: mtk-sd: Add hs400 dly3 setting

Add hs400 dly3 setting for mtk-sd yaml

Signed-off-by: Wenbin Mei <wenbin.mei@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20210917124803.22871-2-wenbin.mei@mediatek.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>