perf/cxlpmu: Fix devm_kcalloc() argument order in cxl_pmu_probe()

perf/cxlpmu: Fix devm_kcalloc() argument order in cxl_pmu_probe()

The previous code mistakenly swapped the count and size parameters.
This fix corrects the argument order in devm_kcalloc() to follow the
conventional count, size form, avoiding potential confusion or bugs.

Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://lore.kernel.org/r/20250624194350.109790-2-alok.a.tiwari@oracle.com
Signed-off-by: Will Deacon <will@kernel.org>