cpu/x86/Makefile.inc: Build smi_trigger on !HAVE_SMI_HANDLER

A lot of soc code requires a definition of apm_control, which
smm/smi_trigger.c provided for !HAVE_SMI_HANDLER, but is not added as
a build target.

Fixes building Q35 without smihandler.

Change-Id: Ie57819b3d169311371a1caca83c9b0c796b46048
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59913
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>

src/cpu/x86/Makefile.inc

@@ -8,7 +8,10 @@ all-$(CONFIG_ARCH_ALL_STAGES_X86_64) += 64bit/mode_switch.S
 
 subdirs-$(CONFIG_PARALLEL_MP) += name
 ramstage-$(CONFIG_PARALLEL_MP) += mp_init.c
+
 ramstage-y += backup_default_smm.c
+ramstage-y += smi_trigger.c
+smm-y += smi_trigger.c
 
 subdirs-$(CONFIG_CPU_INTEL_COMMON_SMM) += ../intel/smm
 

src/cpu/x86/smm/Makefile.inc

@@ -1,7 +1,6 @@
 ## SPDX-License-Identifier: GPL-2.0-only
 
 ramstage-y += smm_module_loader.c
-ramstage-y += smi_trigger.c
 
 ifeq ($(CONFIG_ARCH_RAMSTAGE_X86_32),y)
 $(eval $(call create_class_compiler,smm,x86_32))
@@ -29,7 +28,6 @@ ramstage-srcs += $(obj)/cpu/x86/smm/smm.manual
 endif
 
 smm-y += save_state.c
-smm-y += smi_trigger.c
 
 ifeq ($(CONFIG_SMM_TSEG),y)