Adds a custom test_main and renames the test suite for jitter_drift.
Runs the jitter_drift test suite.
The order of these tests matter on hardware as the counter is often
reset on loading the test program. This is useful as its far less likely
to encounter a clock counter rollover. On arm this is especially useful.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
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