drm/xe/pmu: Replace sprintf() with sysfs_emit()

Replace sprintf() calls with sysfs_emit() to follow current kernel
coding standards.

sysfs_emit() is the preferred method for formatting sysfs output as it
provides better bounds checking and is more secure.

Signed-off-by: Madhur Kumar <madhurkumar004@gmail.com>
Link: https://patch.msgid.link/20251214083659.2412218-1-madhurkumar004@gmail.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
[Rodrigo adjusted commit message while pushing it]

Author: MadhurKumar004

drivers/gpu/drm/xe/xe_pmu.c

@@ -425,7 +425,7 @@ static ssize_t event_attr_show(struct device *dev,
 	struct perf_pmu_events_attr *pmu_attr =
 		container_of(attr, struct perf_pmu_events_attr, attr);
 
-	return sprintf(buf, "event=%#04llx\n", pmu_attr->id);
+	return sysfs_emit(buf, "event=%#04llx\n", pmu_attr->id);
 }
 
 #define XE_EVENT_ATTR(name_, v_, id_)					\