Remove explicit define of "CONFIG_CPU_PERF_CSRS".
Remove explicit define of "CONFIG_CPU_PERF_CSRS".

Now use "--cpu-variant=perf+cfu" to get perf CSRs.

Signed-off-by: Tim Callahan <ea16a3c075a6a229c9a452aa4faba7441b41c040@google.com>

google/CFU-Playground,google/CFU-Playground,google/CFU-Playground,google/CFU-Playground