iommu/mediatek: Contain MM IOMMU flow with the MM TYPE

Prepare for supporting INFRA_IOMMU, and APU_IOMMU later.

For Infra IOMMU/APU IOMMU, it doesn't have the "larb""port". thus, Use
the MM flag contain the MM_IOMMU special flow, Also, it moves a big
chunk code about parsing the mediatek,larbs into a function, this is
only needed for MM IOMMU. and all the current SoC are MM_IOMMU.

The device link between iommu consumer device and smi-larb device only
is needed in MM iommu case.

Signed-off-by: Yong Wu <[email protected]>
Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Reviewed-by: Matthias Brugger <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

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