scsi: ufs-mediatek: dt-bindings: Add mt8192-ufshci compatible string

Add "mediatek,mt8192-ufshci" compatible string to for MediaTek UFS host
controller present on MT8192 chipsets.

Link: https://lore.kernel.org/r/20200914050052.3974-3-stanley.chu@mediatek.com


Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>