bootstd: Move bootflow-adding to bootstd

This relates to more than just the bootdev, since there is a global list
of bootflows. Move the function to the bootstd file and rename it.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/bootstd.h

@@ -105,4 +105,21 @@ void bootstd_clear_glob(void);
  */
 int bootstd_prog_boot(void);
 
+/**
+ * bootstd_add_bootflow() - Add a bootflow to the bootdev's and global list
+ *
+ * All fields in @bflow must be set up. Note that @bflow->dev is used to add the
+ * bootflow to that device.
+ *
+ * The bootflow is also added to the global list of all bootflows
+ *
+ * @dev: Bootdev device to add to
+ * @bflow: Bootflow to add. Note that fields within bflow must be allocated
+ *	since this function takes over ownership of these. This functions makes
+ *	a copy of @bflow itself (without allocating its fields again), so the
+ *	caller must dispose of the memory used by the @bflow pointer itself
+ * Return: 0 if OK, -ENOMEM if out of memory
+ */
+int bootstd_add_bootflow(struct bootflow *bflow);
+
 #endif