delay tracer now longer than randomstall

Created by: davideschiavone

When simulating the example_tb with modelsim with random stalls on Data and Instruction memory as:

make custom-vsim-run CUSTOM_GCC_FLAGS="-DRANDOM_MEM_STALL" I get the errors:

UVM_ERROR ../../bhv/cv32e40p_tracer.sv(443) @ 3085ns: reporter [TRACER] WB .....

Intuitively, as the random stalls add delay, I though it was due a race condition. Therefore I made the time of the random stall generator shorter and the one from the tracer longer.

This solved my issue.

Let me know if that makes sense

Signed-off-by: Pasquale Davide Schiavone