x86: Move common PCH code into a common place

The SATA indexed register write functions are common to several Intel PCHs.
Move this into a common location.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/intel_common/Makefile b/arch/x86/cpu/intel_common/Makefile
index 1918ca3..74b097a 100644
--- a/arch/x86/cpu/intel_common/Makefile
+++ b/arch/x86/cpu/intel_common/Makefile
@@ -11,4 +11,5 @@
 ifndef CONFIG_TARGET_EFI
 obj-y += microcode.o
 endif
+obj-y += pch.o
 obj-$(CONFIG_HAVE_MRC) += report_platform.o