Add the Intel FSP 206ax CPU core support

Add support for 206ax using the Intel FSP.
The FSP is different enough to warrant its own source files
for now. It has different CAR code, micorcode, and FSP inclusion.
It may be possible to combine this code with the mrc based
solution used by the chromebooks in the future.

Change-Id: I5105631af34e9c3a804ace908c4205f073abb9b4
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: http://review.coreboot.org/4016
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/cpu/intel/Kconfig

@@ -10,6 +10,7 @@ source src/cpu/intel/model_6fx/Kconfig
 source src/cpu/intel/model_1067x/Kconfig
 source src/cpu/intel/model_106cx/Kconfig
 source src/cpu/intel/model_206ax/Kconfig
+source src/cpu/intel/fsp_model_206ax/Kconfig
 source src/cpu/intel/model_2065x/Kconfig
 source src/cpu/intel/model_f0x/Kconfig
 source src/cpu/intel/model_f1x/Kconfig