bloblist: Rename the SPL tag

Add a U_BOOT prefix to this tag since it is specific to the U-Boot
project.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/broadwell/cpu_from_spl.c b/arch/x86/cpu/broadwell/cpu_from_spl.c
index e5f62e7..df5a967 100644
--- a/arch/x86/cpu/broadwell/cpu_from_spl.c
+++ b/arch/x86/cpu/broadwell/cpu_from_spl.c
@@ -23,7 +23,7 @@
 {
 	struct spl_handoff *ho;
 
-	ho = bloblist_find(BLOBLISTT_SPL_HANDOFF, sizeof(*ho));
+	ho = bloblist_find(BLOBLISTT_U_BOOT_SPL_HANDOFF, sizeof(*ho));
 	if (!ho)
 		return log_msg_ret("Missing SPL hand-off info", -ENOENT);
 	handoff_load_dram_size(ho);
@@ -56,7 +56,7 @@
 {
 	struct spl_handoff *ho;
 
-	ho = bloblist_find(BLOBLISTT_SPL_HANDOFF, sizeof(*ho));
+	ho = bloblist_find(BLOBLISTT_U_BOOT_SPL_HANDOFF, sizeof(*ho));
 	if (!ho)
 		return log_msg_ret("Missing SPL hand-off info", -ENOENT);
 	handoff_load_dram_banks(ho);