drivers perf: remove unused field pmu_node

The driver does not use the pmu_node field, so remove it.

Signed-off-by: Yunhui Cui <[e-mail]>
Reviewed-by: Shuai Xue <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Will Deacon <[e-mail]>

drivers/perf/dwc_pcie_pmu.c

···
 	u16			ras_des_offset;
 	u32			nr_lanes;
 
-	struct list_head	pmu_node;
 	struct hlist_node	cpuhp_node;
 	struct perf_event	*event[DWC_PCIE_EVENT_TYPE_MAX];
 	int			on_cpu;