bloblist: Locate bloblist in U-Boot

Add support for locating a bloblist in U-Boot that has been set up by SPL.
It is copied into RAM during relocation.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

include/asm-generic/global_data.h

@@ -122,6 +122,10 @@ typedef struct global_data {
 	struct list_head log_head;	/* List of struct log_device */
 	int log_fmt;			/* Mask containing log format info */
 #endif
+#if CONFIG_IS_ENABLED(BLOBLIST)
+	struct bloblist_hdr *bloblist;	/* Bloblist information */
+	struct bloblist_hdr *new_bloblist;	/* Relocated blolist info */
+#endif
 } gd_t;
 #endif