perf: arm-ni: Fix missing platform_set_drvdata()

Add missing platform_set_drvdata in arm_ni_probe(), otherwise
calling platform_get_drvdata() in remove returns NULL.

Fixes: 4d5a768 ("perf: Add driver for Arm NI-700 interconnect PMU")
Signed-off-by: Hongbo Yao <andy.xu@hj-micro.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20250401054248.3985814-1-andy.xu@hj-micro.com
Signed-off-by: Will Deacon <will@kernel.org>

Author: hober-yao

drivers/perf/arm-ni.c

@@ -660,6 +660,7 @@ static int arm_ni_probe(struct platform_device *pdev)
 	ni->num_cds = num_cds;
 	ni->part = part;
 	ni->id = atomic_fetch_inc(&id);
+	platform_set_drvdata(pdev, ni);
 
 	for (int v = 0; v < cfg.num_components; v++) {
 		reg = readl_relaxed(cfg.base + NI_CHILD_PTR(v));