iommu/arm-smmu-v3: Remove IAS

iommu/arm-smmu-v3: Remove IAS

The driver only supports AArch64 page tables where OAS == IAS.

Remove the extra IAS tracking for AArch32 as this feature was
never implemented and that was creating BAD_STEs for SMMUv3
with stage-2 and OAS < 40.

Further discussion on this in:
https://lore.kernel.org/linux-iommu/20251130194506.593700-1-smostafa@google.com/

Reported-by: Tomasz Nowicki <tnowicki@google.com>
Fixes: f0c453dbcce7 ("iommu/arm-smmu: Ensure IAS is set correctly for AArch32-capable SMMUs")
Signed-off-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Will Deacon <will@kernel.org>