iommu/arm-smmu: Record page table configuration in debug structures

Log relevant information about an IOMMU domain's page table (e.g.
the page table format, levels, etc) as part of the debug attachments
structure for a domain. This is helpful in determining how to parse
the IOMMU page tables during post-mortem analysis.

Change-Id: I2ce6cb8843f1f353b53e5474e00da7e8aedc64c8
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>