button_upper.c:Modify the unknown command message level in ioctl to iinfo

Signed-off-by: chenrun1 <chenrun1@xiaomi.com>

drivers/input/button_upper.c

@@ -630,7 +630,7 @@ static int btn_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
       break;
 
     default:
-      ierr("ERROR: Unrecognized command: %d\n", cmd);
+      iinfo("ERROR: Unrecognized command: %d\n", cmd);
       ret = -ENOTTY;
       break;
     }