intel/broadwell: Use smm_subregion()

Change-Id: I95f1685f9b74f68fd6cb681a614e52b8e0748216
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34738
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/broadwell/pei_data.c b/src/soc/intel/broadwell/pei_data.c
index d8059ec..f745348 100644
--- a/src/soc/intel/broadwell/pei_data.c
+++ b/src/soc/intel/broadwell/pei_data.c
@@ -38,7 +38,7 @@
 	pei_data->gttbar = EARLY_GTT_BAR;
 	pei_data->pmbase = ACPI_BASE_ADDRESS;
 	pei_data->gpiobase = GPIO_BASE_ADDRESS;
-	pei_data->tseg_size = smm_region_size();
+	pei_data->tseg_size = CONFIG_SMM_TSEG_SIZE;
 	pei_data->temp_mmio_base = EARLY_TEMP_MMIO;
 	pei_data->tx_byte = &send_to_console;
 	pei_data->ddr_refresh_2x = 1;