[REGRESSION][BISECT] perf/core: Remove pmu linear searching code

[Krzysztof Kozlowski]

Hi,

#regzbot introduced: 9551fbb64d09

Bisect pointed to commit 9551fbb64d09 ("perf/core: Remove pmu linear
searching code") as first one where all hardware events are gone from
perf for ARMv7 Exynos5422 board.

Expected:
perf list | grep "Hardware event"
  branch-instructions OR branches                    [Hardware event]
  branch-misses                                      [Hardware event]
  bus-cycles                                         [Hardware event]
  cache-misses                                       [Hardware event]
  cache-references                                   [Hardware event]
  cpu-cycles OR cycles                               [Hardware event]
  instructions                                       [Hardware event]


Result:
empty, no hardware events

1. Arch ARM Linux
2. exynos_defconfig
3. Board:
   - Odroid HC1
     ARMv7, octa-core (Cortex-A7+A15), Exynos5422 SoC
     Systemd: v239

4. perf version 6.1.0


Best regards,
Krzysztof