bootstd: Drop the bootdev-specific list of bootflows

This list is only used by two functions, which can be updated to iterate
through the global list. Take this approach, which allows the bootdev
list to be dropped.

Overall this makes the code slightly more complicated, but will allow
moving the bootflow list into an alist

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/bootflow.h b/include/bootflow.h
index 4d2fc7b..64d1d6c 100644
--- a/include/bootflow.h
+++ b/include/bootflow.h
@@ -56,12 +56,10 @@
 /**
  * struct bootflow - information about a bootflow
  *
- * This is connected into two separate linked lists:
+ * This is connected into a linked list:
  *
- *   bm_sibling - links all bootflows in the same bootdev
  *   glob_sibling - links all bootflows in all bootdevs
  *
- * @bm_node: Points to siblings in the same bootdev
  * @glob_node: Points to siblings in the global list (all bootdev)
  * @dev: Bootdev device which produced this bootflow, NULL for flows created by
  *      BOOTMETHF_GLOBAL bootmeths
@@ -92,7 +90,6 @@
  * @bootmeth_priv: Private data for the bootmeth
  */
 struct bootflow {
-	struct list_head bm_node;
 	struct list_head glob_node;
 	struct udevice *dev;
 	struct udevice *blk;