perf/x86/intel/uncore: Fix the scale of IIO free running counters on ICX

There was a mistake in the ICX uncore spec too. The counter increments
for every 32 bytes rather than 4 bytes.

The same as SNR, there are 1 ioclk and 8 IIO bandwidth in free running
counters. Reuse the snr_uncore_iio_freerunning_events().

Fixes: 2b3b76b5 ("perf/x86/intel/uncore: Add Ice Lake server uncore support")
Reported-by: Tang Jun <dukang.tj@alibaba-inc.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250416142426.3933977-2-kan.liang@linux.intel.com