x86: Add basic support for broadwell

This adds the broadwell architecture, with the CPU driver and some useful
header files.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile
index 2583809..2667e0b 100644
--- a/arch/x86/cpu/Makefile
+++ b/arch/x86/cpu/Makefile
@@ -20,6 +20,7 @@
 
 obj-y += intel_common/
 obj-$(CONFIG_INTEL_BAYTRAIL) += baytrail/
+obj-$(CONFIG_INTEL_BROADWELL) += broadwell/
 obj-$(CONFIG_SYS_COREBOOT) += coreboot/
 obj-$(CONFIG_EFI_APP) += efi/
 obj-$(CONFIG_QEMU) += qemu/