x86: ivybridge: Add PCH init

Add required init for the Intel Platform Controller Hub in ivybridge.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/ivybridge/Makefile b/arch/x86/cpu/ivybridge/Makefile
index b37fb8f..479e446 100644
--- a/arch/x86/cpu/ivybridge/Makefile
+++ b/arch/x86/cpu/ivybridge/Makefile
@@ -12,6 +12,7 @@
 obj-y += lpc.o
 obj-y += me_status.o
 obj-y += microcode_intel.o
+obj-y += pch.o
 obj-y += pci.o
 obj-y += report_platform.o
 obj-y += sdram.o