drivers/intel/fsp2_0: Hook up IntelFSP repo

With https://github.com/IntelFsp/FSP/pull/4 merged, this allows using
Intel's FSP repo (that we mirror) to build a complete BIOS ifd region
with a simple coreboot build, automatically drawing in headers and
binaries.

This commit covers Apollolake, Coffeelake, Skylake, and Kabylake.

Skylake is using Kabylake's FSP since its own is FSP 1.1 and Kabylake's
also supports Skylake.

Another candidate (given 3rdparty/fsp's content) is Denverton NS, but
it requires changes to coreboot's FSP bindings to become compatible.

Cannonlake, Whiskeylake require an FSP release.

Change-Id: I8d838ca6555348ce877f54e95907e9fdf6b9f2e7
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/28593
Reviewed-by: Pratikkumar V Prajapati <pratikkumar.v.prajapati@intel.com>
Reviewed-by: Naresh Solanki <naresh.solanki@intel.com>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/Kconfig

@@ -302,6 +302,20 @@ config USE_SKYLAKE_FSP_CAR
 
 endchoice
 
+config FSP_HEADER_PATH
+	string
+	depends on MAINBOARD_USES_FSP2_0
+	# Use KabylakeFsp for both Skylake and Kabylake as it supports both.
+	# SkylakeFsp is FSP 1.1 and therefore incompatible.
+	default "3rdparty/fsp/KabylakeFspBinPkg/Include/" if SOC_INTEL_SKYLAKE
+	default "3rdparty/fsp/KabylakeFspBinPkg/Include/" if SOC_INTEL_KABYLAKE
+
+config FSP_FD_PATH
+	string
+	depends on FSP_USE_REPO
+	default "3rdparty/fsp/KabylakeFspBinPkg/Fsp.fd" if SOC_INTEL_SKYLAKE
+	default "3rdparty/fsp/KabylakeFspBinPkg/Fsp.fd" if SOC_INTEL_KABYLAKE
+
 config SKIP_FSP_CAR
 	bool "Skip cache as RAM setup in FSP"
 	default y