Merging commit 5c816728651ae425954542fed64d21 into mtk-v5.15-dev, and
the results remain the same:

```
root@genio-1200-evk:~# sudo taskset -c 7 perf stat -e 
armv8_cortex_a55/cpu_cycles/ -e armv8_cortex_a78/cpu_cycles/ -e cycles sleep 1

 Performance counter stats for 'sleep 1':

     <not counted>      armv8_cortex_a55/cpu_cycles/                            
         (0.00%)
            770458      armv8_cortex_a78/cpu_cycles/
     <not counted>      cycles                                                  
      (0.00%)

       1.001531615 seconds time elapsed

       0.001367000 seconds user
       0.000000000 seconds sys
```

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https://bugs.launchpad.net/bugs/2060063

Title:
  PMU counters for Cortex-A78 not working correctly

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