iommu/mediatek: Adapt sharing and non-sharing pgtable case

In previous mt2712, Both IOMMUs are MM IOMMU, and they will share pgtable.
However in the latest SoC, another is infra IOMMU, there is no reason to
share pgtable between MM with INFRA IOMMU. This patch manage to
implement the two case(sharing and non-sharing pgtable).

Currently we use for_each_m4u to loop the 2 HWs. Add the list_head into
this macro.
In the sharing pgtable case, the list_head is the global "m4ulist".
In the non-sharing pgtable case, the list_head is hw_list_head which is a
variable in the "data". then for_each_m4u will only loop itself.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://lore.kernel.org/r/20220503071427.2285-10-yong.wu@mediatek.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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