perf/qcom: 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 platform devices.

Link: https://lore.kernel.org/linux-cxl/ZCLI9A40PJsyqAmq@kroah.com/
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20240412161057.14099-15-Jonathan.Cameron@huawei.comSigned-off-by: Will Deacon <will@kernel.org>

drivers/perf/qcom_l2_pmu.c

@@ -902,6 +902,7 @@ static int l2_cache_pmu_probe(struct platform_device *pdev)
 	l2cache_pmu->pmu = (struct pmu) {
 		/* suffix is instance id for future use with multiple sockets */
 		.name		= "l2cache_0",
+		.parent		= &pdev->dev,
 		.task_ctx_nr    = perf_invalid_context,
 		.pmu_enable	= l2_cache_pmu_enable,
 		.pmu_disable	= l2_cache_pmu_disable,

drivers/perf/qcom_l3_pmu.c

@@ -748,6 +748,7 @@ static int qcom_l3_cache_pmu_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	l3pmu->pmu = (struct pmu) {
+		.parent		= &pdev->dev,
 		.task_ctx_nr	= perf_invalid_context,
 
 		.pmu_enable	= qcom_l3_cache__pmu_enable,