x86: broadwell: Add a PCH driver

Add a driver for the broadwell low-power platform controller hub.

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 c7ef630..128829a 100644
--- a/arch/x86/cpu/broadwell/Makefile
+++ b/arch/x86/cpu/broadwell/Makefile
@@ -5,3 +5,5 @@
 #
 
 obj-y += cpu.o
+obj-y += iobp.o
+obj-y += pch.o