bloblist: Add functions to obtain base address and size

Add a few convenience functions to obtain useful information about the
bloblist.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/bloblist.c b/common/bloblist.c
index 0049bb9..1ed9172 100644
--- a/common/bloblist.c
+++ b/common/bloblist.c
@@ -367,6 +367,18 @@
 	return 0;
 }
 
+ulong bloblist_get_base(void)
+{
+	return map_to_sysmem(gd->bloblist);
+}
+
+ulong bloblist_get_size(void)
+{
+	struct bloblist_hdr *hdr = gd->bloblist;
+
+	return hdr->size;
+}
+
 void bloblist_get_stats(ulong *basep, ulong *sizep, ulong *allocedp)
 {
 	struct bloblist_hdr *hdr = gd->bloblist;