soc/intel/braswell: add vmx support via CPU_INTEL_COMMON

Braswell allready supported vmx, but offered no mechanism to unset it, nor
to set the lock bit required for Windows to recognize virtualization.
Enable this functionality by adding CPU_INTEL_COMMON config.

Test: build/boot Windows 10 on Braswell ChromeOS device, verify Windows shows
virtualization as enabled.

Change-Id: I0d39abaeb9eebcceb37dc791df6b06e521fe1992
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/29570
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/soc/intel/braswell/Kconfig

@@ -47,6 +47,7 @@ config CPU_SPECIFIC_OPTIONS
 	select GENERIC_GPIO_LIB
 	select INTEL_GMA_ACPI
 	select INTEL_GMA_SWSMISCI
+	select CPU_INTEL_COMMON
 
 config VBOOT
 	select VBOOT_STARTS_IN_ROMSTAGE

src/soc/intel/braswell/Makefile.inc

@@ -7,6 +7,7 @@ subdirs-y += ../../../cpu/x86/smm
 subdirs-y += ../../../cpu/x86/tsc
 subdirs-y += ../../../cpu/intel/microcode
 subdirs-y += ../../../cpu/intel/turbo
+subdirs-y += ../../../cpu/intel/common
 
 romstage-y += gpio_support.c
 romstage-y += iosf.c

src/soc/intel/braswell/cpu.c

@@ -16,6 +16,7 @@
 
 #include <console/console.h>
 #include <cpu/cpu.h>
+#include <cpu/intel/common/common.h>
 #include <cpu/intel/microcode.h>
 #include <cpu/intel/turbo.h>
 #include <cpu/x86/cache.h>
@@ -60,6 +61,9 @@ static void soc_core_init(struct device *cpu)
 	if (lapicid())
 		enable_turbo();
 
+	/* Set virtualization based on Kconfig option */
+	set_vmx();
+
 	/* Set core MSRs */
 	reg_script_run(core_msr_script);