soc/intel/fsp_broadwell_de: Enable STM for broadwell_de

This patch enables the STM for broadwell_de by setting CONFIG_VMX

Change-Id: I8292bb4eec516556ad1ba658c80ad8a0b541139f
Signed-off-by: Eugene Myers <edmyers@tycho.nsa.gov>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55626
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/soc/intel/fsp_broadwell_de/Kconfig

@@ -95,6 +95,10 @@ config HPET_MIN_TICKS
 	hex
 	default 0x80
 
+config ENABLE_VMX
+	bool "Enable VMX for virtualization"
+	default y
+
 ## Broadwell-DE Specific FSP Kconfig
 source src/soc/intel/fsp_broadwell_de/fsp/Kconfig