x86: Move cache-as-RAM code into a common location

This cache-as-RAM (CAR) code is common to several Intel chips. Create a new
intel_common directory and move it in there.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile
index 2ff2377..2583809 100644
--- a/arch/x86/cpu/Makefile
+++ b/arch/x86/cpu/Makefile
@@ -18,6 +18,7 @@
 
 extra-y += call32.o
 
+obj-y += intel_common/
 obj-$(CONFIG_INTEL_BAYTRAIL) += baytrail/
 obj-$(CONFIG_SYS_COREBOOT) += coreboot/
 obj-$(CONFIG_EFI_APP) += efi/