x86: broadwell: Add reference code support

Broadwell needs a special binary blob to set up the PCH. Add code to run
this on start-up.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/broadwell/Makefile b/arch/x86/cpu/broadwell/Makefile
index 3054a89..a542fef 100644
--- a/arch/x86/cpu/broadwell/Makefile
+++ b/arch/x86/cpu/broadwell/Makefile
@@ -10,4 +10,5 @@
 obj-y += northbridge.o
 obj-y += pch.o
 obj-y += pinctrl_broadwell.o
+obj-y += refcode.o
 obj-y += sata.o