x86: ivybridge: Enable 206ax cpu driver for FSP build

At present this 206ax cpu driver is only built when FSP is not used.
This updates the Makefile to enable the build for both cases.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/ivybridge/Makefile b/arch/x86/cpu/ivybridge/Makefile
index 27cfb26..716134e 100644
--- a/arch/x86/cpu/ivybridge/Makefile
+++ b/arch/x86/cpu/ivybridge/Makefile
@@ -8,7 +8,6 @@
 obj-$(CONFIG_$(SPL_)X86_32BIT_INIT) += cpu.o
 obj-y += early_me.o
 obj-y += lpc.o
-obj-y += model_206ax.o
 obj-y += northbridge.o
 ifndef CONFIG_SPL_BUILD
 obj-y += sata.o
@@ -18,4 +17,5 @@
 obj-y += sdram_nop.o
 endif
 endif
+obj-y += model_206ax.o
 obj-y += bd82x6x.o