Test: Run Extra tests last

Run extra tests as last test suite, this way platform
can execute some code after all tests are done.

For example in extra test suite platform can dump code
coverage results after all test suites are run.

Change-Id: I495210a044841c434eb2e401d7e8aaa915afb30f
Signed-off-by: Bohdan Hunko <Bohdan.Hunko@infineon.com>