bloblist: Reserve an aligned base

Make sure that the bloblist starts on an aligned boundary. This protects
against one of the early allocating causing the alignment to be lost.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/board_f.c b/common/board_f.c
index 591f18f..4852a3b 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -588,6 +588,7 @@
 static int reserve_bloblist(void)
 {
 #ifdef CONFIG_BLOBLIST
+	gd->start_addr_sp &= ~0xf;
 	gd->start_addr_sp -= CONFIG_BLOBLIST_SIZE;
 	gd->new_bloblist = map_sysmem(gd->start_addr_sp, CONFIG_BLOBLIST_SIZE);
 #endif