iommu/arm-smmu-v3: Log better event records

Currently, the driver dumps the raw hex for a received event record.
Improve this by leveraging `struct arm_smmu_event` for event fields
and log human-readable event records with meaningful information.

Signed-off-by: Pranjal Shrivastava <praan@google.com>
Link: https://lore.kernel.org/r/20241203184906.2264528-3-praan@google.com


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