dt-bindings: mediatek: mt8195: Add binding for MM IOMMU

dt-bindings: mediatek: mt8195: Add binding for MM IOMMU

This patch adds descriptions for mt8195 IOMMU which also use ARM
Short-Descriptor translation table format.

In mt8195, 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    ...

Another change is that we have a new IOMMU that is for infra master like
PCIe and USB. The infra master don't have the larb and ports, thus we
rename the port header file to mt8195-memory-port.h rather than
mt8195-larb-port.h.

Also, the IOMMU is not only for MM, thus, we don't call it "m4u" which
means "MultiMedia Memory Management UNIT". thus, use the "iommu" as the
compatiable string.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://lore.kernel.org/r/20220503071427.2285-2-yong.wu@mediatek.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>