soc/intel/cannonlake: Configure Vmx support using Kconfig

Change VmxEnable UPD values based on Kconfig ENABLE_VMX
and remove it from Devicetree and chip.h

Remove Vmx dependency on Vt-d

Change-Id: I4180c2270038a28befd6ed53c9485905025a15ba
Signed-off-by: Ronak Kanabar <ronak.kanabar@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32117
Reviewed-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/cannonlake/chip.h

@@ -354,7 +354,6 @@ struct soc_intel_cannonlake_config {
 
 	/* Intel VT configuration */
 	uint8_t VtdDisable;
-	uint8_t VmxEnable;
 
 	/*
 	 * Acoustic Noise Mitigation