x86: ivybridge: Perform Intel microcode update on boot

Microcode updates are stored in the device tree. Work through these and
apply any that are needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/ivybridge/Makefile b/arch/x86/cpu/ivybridge/Makefile
index 4b77c9c..74f01e8 100644
--- a/arch/x86/cpu/ivybridge/Makefile
+++ b/arch/x86/cpu/ivybridge/Makefile
@@ -7,5 +7,6 @@
 obj-y += car.o
 obj-y += cpu.o
 obj-y += lpc.o
+obj-y += microcode_intel.o
 obj-y += pci.o
 obj-y += sdram.o