iommu: iommu-debug: Remove CONFIG_IOMMU_DEBUG_TRACKING

Remove this interface in preparation for a more modern replacement.

Change-Id: I84e6827167be54366bb78c6389131119ca6ccd33
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
[isaacm@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>