perf stat: Fix non-uniquified hybrid legacy events

perf stat: Fix non-uniquified hybrid legacy events

Legacy hybrid events have attr.type == PERF_TYPE_HARDWARE, so they look
like plain legacy events if we only look at attr.type. But legacy events
should still be uniquified if they were opened on a non-legacy PMU. Fix
it by checking if the evsel is hybrid and forcing needs_uniquify
before looking at the attr.type.

This restores PMU names on hybrid systems and also changes "perf stat
metrics (shadow stat) test" from a FAIL back to a SKIP (on hybrid). The
test was gated on "cycles" appearing alone which doesn't happen on
here.

Before:
  $ perf stat -- true
  ...
     <not counted>      instructions:u                           (0.00%)
           162,536      instructions:u            # 0.58  insn per cycle
  ...

After:
  $ perf stat -- true
  ...
      <not counted>      cpu_atom/instructions/u                  (0.00%)
            162,541      cpu_core/instructions/u   # 0.62  insn per cycle
  ...

Fixes: 357b965deba9 ("perf stat: Changes to event name uniquification")
Suggested-by: Ian Rogers <irogers@google.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Tested-by: Thomas Falcon <thomas.falcon@intel.com>
Link: https://lore.kernel.org/r/20250226145526.632380-1-james.clark@linaro.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>