completed directed interrupt_test for the cv32e40p

Created by: strichmo

Signed-off-by: Steve Richmond Steve.Richmond@silabs.com

This test should cover all directed scenarios in the current Interrupt Vplan.

Note that this test does not work with the Imperas ISS as the interrupt integration is not yet complete. That effort is currently in development.

The test was verified in vsim and xrun. To run: % make interrupt_test SIMULATOR=vsim USE_ISS=0