log: Add missing category names

Add some category names that were missed in recent changes. Update the
comment as a reminder.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/log.h b/include/log.h
index 4acc087..6de5e61 100644
--- a/include/log.h
+++ b/include/log.h
@@ -42,7 +42,9 @@
 
 /**
  * Log categories supported. Most of these correspond to uclasses (i.e.
- * enum uclass_id) but there are also some more generic categories
+ * enum uclass_id) but there are also some more generic categories.
+ *
+ * Remember to update log_cat_name[] after adding a new category.
  */
 enum log_category_t {
 	LOGC_FIRST = 0,	/* First part mirrors UCLASS_... */