[Spike tandem] Fix Yaml config files for CV32A65X. Fix Questa tandem. Add workaround for AXI end-of-test asserts.
Created by: zchamski
Fix incorrect structure of the Spike Yaml file. Fix ISA strings in riscv-config spec and outputs. Fix Questa tandem invocation. Add 100 cycle delay after end of test to settle outstanding AXI requests when using UVM.