mb/google/dedede/var/taranza: Add Wifi SAR for taranza

BUG=b:297276380
BRANCH=dedede
TEST=enable CHROMEOS_WIFI_SAR in config of coreboot,
emerge-dedede coreboot-private-files-baseboard-dedede coreboot
chromeos-bootimage

Cq-Depend: chrome-internal:6373154

Signed-off-by: Sheng-Liang Pan <sheng-liang.pan@quanta.corp-partner.google.com>
Change-Id: If21c7a7d329b0b1cc2c73dadb0c5b8a5b8ab27e2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77399
Reviewed-by: David Wu <david_wu@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tyler Wang <tyler.wang@quanta.corp-partner.google.com>

src/mainboard/google/dedede/Kconfig.name

@@ -208,6 +208,7 @@ config BOARD_GOOGLE_TARANZA
 	select RT8168_GEN_ACPI_POWER_RESOURCE
 	select RT8168_GET_MAC_FROM_VPD
 	select RT8168_SET_LED_MODE
+	select GEO_SAR_ENABLE if CHROMEOS_WIFI_SAR
 
 config BOARD_GOOGLE_BOXY
 	bool "->  Boxy"

src/mainboard/google/dedede/variants/taranza/Makefile.inc

@@ -1,3 +1,5 @@
 ## SPDX-License-Identifier: GPL-2.0-or-later
 
 ramstage-y += gpio.c
+
+ramstage-y += variant.c

src/mainboard/google/dedede/variants/taranza/variant.c

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <sar.h>
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	return "wifi_sar-taranza.hex";
+}