soc/intel/cannonlake: Add VT-d and VMX programming

Add FSP option to enable/disable VT-d (Intel Virtualization Technology
for Directed I/O) and VMX (Virtual Machine Extensions), VMX will be
disabled once VT-d got disabled.

Bug=b:73655383
TEST=Build and flash image on meowth board with debug build FSP, in
serial log search for "VMXEnable" and "VtdDiable".

Change-Id: I589590450aa4b9302ee2f9bb7b879a332f50b73e
Signed-off-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/25118
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/cannonlake/chip.h

@@ -281,6 +281,10 @@ struct soc_intel_cannonlake_config {
 
 	/* Enable Pch iSCLK */
 	uint8_t pch_isclk;
+
+	/* Intel VT configuration */
+	uint8_t VtdDisable;
+	uint8_t VmxEnable;
 };
 
 typedef struct soc_intel_cannonlake_config config_t;