x86: broadwell: Allow booting from SPL

At present broadwell only supports booting straight into U-Boot proper.
Add a separate init file to boot from SPL into U-Boot proper, and select
it when SPL is in use.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/broadwell/Makefile b/arch/x86/cpu/broadwell/Makefile
index 8553615..fbc778c 100644
--- a/arch/x86/cpu/broadwell/Makefile
+++ b/arch/x86/cpu/broadwell/Makefile
@@ -5,6 +5,21 @@
 obj-y += adsp.o
 obj-y += cpu.o
 obj-y += cpu_full.o
+
+ifdef CONFIG_SPL
+ifndef CONFIG_SPL_BUILD
+obj-y += cpu_from_spl.o
+obj-y += cpu_full.o
+endif
+ifndef CONFIG_SPL_BUILD
+# obj-y += cpu_from_spl.o
+endif
+endif
+
+ifeq ($(CONFIG_$(SPL_TPL_)X86_32BIT_INIT),)
+#obj-y += cpu_from_spl.o
+endif
+
 obj-y += iobp.o
 obj-y += lpc.o
 obj-y += me.o