x86: apl: Add Kconfig and Makefile

Add basic plumbing to allow Apollo Lake support to be used.

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 0e90a38..5b40838 100644
--- a/arch/x86/cpu/Makefile
+++ b/arch/x86/cpu/Makefile
@@ -41,6 +41,7 @@
 endif
 
 obj-y += intel_common/
+obj-$(CONFIG_INTEL_APOLLOLAKE) += apollolake/
 obj-$(CONFIG_INTEL_BAYTRAIL) += baytrail/
 obj-$(CONFIG_INTEL_BRASWELL) += braswell/
 obj-$(CONFIG_INTEL_BROADWELL) += broadwell/