tests, arm: Reinstate accidentally removed switcheroo tests

Two of the switcheroo tests were accidentally removed due to
unexpected Mercurial behavior.

Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>

tests: Make remaining switcheroo tests functional only

The switcheroo tests only really serve to check functional
correctness. Checking for stat differences in them just increases the
size of reference diffs.

Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>

tests, arm: Make switcheroo and checkpoint tests functional

Switcheroo and checkpoint tests should generally be considered to be
successful if they run to completion. Remove all reference output
files from the switcheroo and checkopint tests to make them purely
functional.

Change-Id: I70b47853bd662b7a33716d9e0d2154b16077f9dc
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>