cpu/qemu-x86: Add the option to have no SMM

Qemu i440fx does not support an smihandler at the moment.

Change-Id: I5526b19b8294042a49e5bca61036e47db01fd28a
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48208
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/mainboard/emulation/qemu-i440fx/Kconfig

@@ -14,6 +14,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select MAINBOARD_HAS_NATIVE_VGA_INIT
 	select MAINBOARD_FORCE_NATIVE_VGA_INIT
 	select HAVE_ASAN_IN_ROMSTAGE
+	select NO_SMM
 
 config VBOOT
 	select VBOOT_MUST_REQUEST_DISPLAY