dm: cpu: Test against cpu_ops->get_info in cpu_get_info()

In cpu_get_info() it wrongly tests against cpu_ops->get_desc to see
if it is NULL. It should test against cpu_ops->get_info.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/cpu/cpu-uclass.c b/drivers/cpu/cpu-uclass.c
index aa0267c..d6be9d4 100644
--- a/drivers/cpu/cpu-uclass.c
+++ b/drivers/cpu/cpu-uclass.c
@@ -26,7 +26,7 @@
 {
 	struct cpu_ops *ops = cpu_get_ops(dev);
 
-	if (!ops->get_desc)
+	if (!ops->get_info)
 		return -ENOSYS;
 
 	return ops->get_info(dev, info);