Update installation flow of test infrastructure.
Created by: zchamski
Update repository URL of the riscv-compliance
suite and improve messages describing the actual configuration used to instantiate individual test suites.
- cva6/regress/install-riscv-arch-test.sh: Improve installation messages.
- cva6/regress/install-riscv-compliance.sh: Update repo URL. Improve installation messages.
- cva6/regress/install-riscv-dv.sh: Improve installation messages.
- cva6/regress/install-riscv-tests.sh: Likewise.