spl: Plumb in the relocating loader

This is fairly easy to use. The SPL loader sets up some fields in the
spl_image_info struct and calls spl_reloc_prepare(). When SPL is ready
to do the jump it must call spl_reloc_jump() instead of jump_to_image().

Add this logic.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/spl.h b/include/spl.h
index 9cfba98..7155e9c 100644
--- a/include/spl.h
+++ b/include/spl.h
@@ -414,6 +414,7 @@
 	load->read = h_read;
 	load->priv = priv;
 	spl_set_bl_len(load, bl_len);
+	xpl_set_phase(load, IH_PHASE_NONE);
 }
 
 /*