sb/intel/ibexpeak: Use common Intel SMM code

TODO in followup patch: Some not mainboard specific things should be
moved out of mainboard_smi_apmc.

Change-Id: Ifc2d8f7755ace598e66b162d071d472093e4656e
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/26296
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/southbridge/intel/ibexpeak/Kconfig

@@ -32,6 +32,7 @@ config SOUTH_BRIDGE_OPTIONS # dummy
 	select SOUTHBRIDGE_INTEL_COMMON_RCBA_PIRQ
 	select SOUTHBRIDGE_INTEL_COMMON_SMBUS
 	select SOUTHBRIDGE_INTEL_COMMON_SPI
+	select SOUTHBRIDGE_INTEL_COMMON_SMM
 	select HAVE_USBDEBUG_OPTIONS
 	select COMMON_FADT
 	select ACPI_SATA_GENERATOR