iommu-debug: Remove extra iterations

If extra iterations are desired, the user can repeat the test as necessary.
Removing this from the kernel function helps the test to run faster, and
also cleans up the indentation level.

Change-Id: Ia643c3aa642dcecaa4f646330bf14d52d491c0e3
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>