perf/xgene: Assign parents for event_source devices

Currently all these devices appear directly under /sys/devices/
Only root busses should appear there, so instead assign the pmu->dev
parents to be the hardware related struct device.

Link: https://lore.kernel.org/linux-cxl/ZCLI9A40PJsyqAmq@kroah.com/
Cc: Khuong Dinh <khuong@os.amperecomputing.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20240412161057.14099-10-Jonathan.Cameron@huawei.comSigned-off-by: Will Deacon <will@kernel.org>

drivers/perf/xgene_pmu.c

@@ -1102,6 +1102,7 @@ static int xgene_init_perf(struct xgene_pmu_dev *pmu_dev, char *name)
 
 	/* Perf driver registration */
 	pmu_dev->pmu = (struct pmu) {
+		.parent		= pmu_dev->parent->dev,
 		.attr_groups	= pmu_dev->attr_groups,
 		.task_ctx_nr	= perf_invalid_context,
 		.pmu_enable	= xgene_perf_pmu_enable,