soc/intel/coffeelake: Add initial coffeelake support

Add coffeelake config and include path to coffeelake fsp header files.

BUG=N/A
TEST=Using private mainboard file can boot up on coffeelake rvp
platform.

Change-Id: Ide180de32a9d1896bed85b9e093963721c3d6041
Signed-off-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/27468
Reviewed-by: Pratikkumar V Prajapati <pratikkumar.v.prajapati@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/cannonlake/Kconfig

@@ -3,6 +3,19 @@ config SOC_INTEL_CANNONLAKE
 	help
 	  Intel Cannonlake support
 
+config SOC_INTEL_COFFEELAKE
+	bool
+	default n
+	select SOC_INTEL_CANNONLAKE
+	help
+	  Intel Coffeelake support
+
+config CANNONLAKE_SOC_PCH_H
+	bool
+	default n
+	help
+	  Choose this option if you have a PCH-H chipset.
+
 if SOC_INTEL_CANNONLAKE
 
 config CPU_SPECIFIC_OPTIONS