iommu: iommu-debug: limit memory address exposure

Update pte and dma atos debugfs nodes to be inline
with other iommu debugfs nodes and only expose memory
addresses when kptr_restrict is disabled.

Change-Id: I46d5de498b811b4874be570aea7b41461b9a1a98
Signed-off-by: Liam Mark <lmark@codeaurora.org>