Fixed counter test and added test scenarios
Created by: Silabs-ArjanB
Made various fixes to the test case (that were only reported by email before). The test now also contains a part aimed at the bug from https://github.com/openhwgroup/cv32e40p/issues/540. This new addition triggers the a_minstret_count and in this case the assertion itself is wrong (has been communicated to the writer)
Signed-off-by: Arjan Bink Arjan.Bink@silabs.com