Add descriptions for mt8188 IOMMU which also use ARM Short-Descriptor
translation table format.

In mt8188, there are two smi-common HW and IOMMU, one is for vdo(video
output), the other is for vpp(video processing pipe). They connects
with different smi-larbs, then some setting(larbid_remap) is different.
Differentiate them with the compatible string.

Something like this:

   IOMMU(VDO)          IOMMU(VPP)
      |                   |
 SMI_COMMON_VDO      SMI_COMMON_VPP
 ---------------     ----------------
  |     |    ...      |     |    ...
larb0 larb2  ...    larb1 larb3  ...

We also have an IOMMU that is for infra master like PCIe.
And infra master don't have the larb and ports.
Signed-off-by: Chengci.Xu <chengci.xu@mediatek.com>
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230602090227.7264-2-yong.wu@mediatek.comSigned-off-by: Joerg Roedel <jroedel@suse.de>