iommu/mediatek: Fix 2 HW sharing pgtable issue

In the commit 4f956c97d26b ("iommu/mediatek: Move domain_finalise into
attach_device"), I overlooked the sharing pgtable case.
After that commit, the "data" in the mtk_iommu_domain_finalise always is
the data of the current IOMMU HW. Fix this for the sharing pgtable case.

Only affect mt2712 which is the only SoC that share pgtable currently.

Fixes: 4f956c97d26b ("iommu/mediatek: Move domain_finalise into attach_device")
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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