iommu/arm-smmu-v3: Fix incorrect return in arm_smmu_attach_dev

After commit 48e7b8e2 ("iommu/arm-smmu-v3: Remove
arm_smmu_domain_finalise() during attach"), an error code is not
returned on the attach path when the smmu does not match with the
domain. This causes problems with VFIO because
vfio_iommu_type1_attach_group() relies on this check to determine domain
compatability.

Re-instate the -EINVAL return value when the SMMU doesn't match on the
device attach path.

Fixes: 48e7b8e2 ("iommu/arm-smmu-v3: Remove arm_smmu_domain_finalise() during attach")
Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com>
Link: https://lore.kernel.org/r/20250422112951.2027969-1-xiaqinxin@huawei.com


Signed-off-by: Will Deacon <will@kernel.org>