Update RISC-V compliance testsuite

Task Outcome

Integrate the latest RISC-V Foundation compliance testsuite into the uvmt_cv32 CV32E40P verification environment. Stretch goal is to also integrated into the core testbench.

Background information

The current version of the compliance testsuite was forked from the PULP-Platform RI5CY project in mid-December 2019. We need to be running with the latest.

Location Information

The current location for the compliance testsuite is cv32/tests/core. It is recommended that the updated compliance tests be committed to cv32/tests/compliance and the existing tests deleted.

Completion Criteria

1. Updated compliance tests installed as above.
2. README to capture Git hash of installed version.
3. Successful compile and regression of the compliance suite in the uvmt_cv32 environment. (Not necessarily 100% passing).
4. Create individual bug issues against the RTL (https://github.com/openhwgroup/cv32e40p/issues) for each failing instruction (if any).
5. Stretch goal: Successful compile and regression of the XPULP compliance suite in the core testbench with both Verilator and your local simulator (e.g. Questa).