perf stat: Remove hard coded shadow metrics

Now that the metrics are encoded in common json the hard coded
printing means the metrics are shown twice. Remove the hard coded
version.

This means that when specifying events, and those events correspond to
a hard coded metric, the metric will no longer be displayed. The
metric will be displayed if the metric is requested. Due to the adhoc
printing in the previous approach it was often found frustrating, the
new approach avoids this.

The default perf stat output on an alderlake now looks like:
```
$ perf stat -a -- sleep 1

 Performance counter stats for 'system wide':

            19,697      context-switches                 #      nan cs/sec  cs_per_second
             TopdownL1 (cpu_core)                 #     10.7 %  tma_bad_speculation
                                                  #     24.9 %  tma_frontend_bound
             TopdownL1 (cpu_core)                 #     34.3 %  tma_backend_bound
                                                  #     30.1 %  tma_retiring
             6,593      page-faults                      #      nan faults/sec  page_faults_per_second
       729,065,658      cpu_atom/cpu-cycles/             #      nan GHz  cycles_frequency       (49.79%)
     1,605,131,101      cpu_core/cpu-cycles/             #      nan GHz  cycles_frequency
                                                  #     19.7 %  tma_bad_speculation
                                                  #     14.2 %  tma_retiring             (50.14%)
                                                  #     37.3 %  tma_frontend_bound       (50.31%)
        87,302,268      cpu_atom/branches/               #      nan M/sec  branch_frequency     (60.27%)
       512,046,956      cpu_core/branches/               #      nan M/sec  branch_frequency
             1,111      cpu-migrations                   #      nan migrations/sec  migrations_per_second
                                                  #     28.8 %  tma_backend_bound        (60.26%)
              0.00 msec cpu-clock                        #      0.0 CPUs  CPUs_utilized
       392,509,323      cpu_atom/instructions/           #      0.6 instructions  insn_per_cycle  (60.19%)
     2,990,369,310      cpu_core/instructions/           #      1.9 instructions  insn_per_cycle
         3,493,478      cpu_atom/branch-misses/          #      5.9 %  branch_miss_rate         (49.69%)
         7,297,531      cpu_core/branch-misses/          #      1.4 %  branch_miss_rate

       1.006621701 seconds time elapsed
```

Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

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