arch/x86: Avoid HAVE_SMI_HANDLER conditional with smm-class

Build of the entire smm-class is skipped if we have
HAVE_SMI_HANDLER=n.

Change-Id: I10b4300ddd18b1673c404b45fd9642488ab3186c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34125
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Lance Zhao <lance.zhao@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/southbridge/intel/lynxpoint/Makefile.inc b/src/southbridge/intel/lynxpoint/Makefile.inc
index 3e3ef35..e53ed8d 100644
--- a/src/southbridge/intel/lynxpoint/Makefile.inc
+++ b/src/southbridge/intel/lynxpoint/Makefile.inc
@@ -42,8 +42,8 @@
 ramstage-$(CONFIG_ELOG) += elog.c
 
 ramstage-$(CONFIG_HAVE_SMI_HANDLER) += smi.c pmutil.c
-smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c me_9.x.c pch.c
-smm-$(CONFIG_HAVE_SMI_HANDLER) += pmutil.c usb_ehci.c usb_xhci.c
+smm-y += smihandler.c me_9.x.c pch.c
+smm-y += pmutil.c usb_ehci.c usb_xhci.c
 
 bootblock-y += early_pch.c
 romstage-y += early_usb.c early_smbus.c early_me.c me_status.c early_pch.c
@@ -52,7 +52,7 @@
 ifeq ($(CONFIG_INTEL_LYNXPOINT_LP),y)
 romstage-y += lp_gpio.c
 ramstage-y += lp_gpio.c
-smm-$(CONFIG_HAVE_SMI_HANDLER) += lp_gpio.c
+smm-y += lp_gpio.c
 endif
 
 verstage-$(CONFIG_VBOOT_SEPARATE_VERSTAGE) += pmutil.c