mb/google/brya/var/xol: add support for wifi sar table

Add wifi sar table support for xol. Bit 31 in CBI/FW_CONFIG
is used to select different sar table (index 0 or 1) but only
0 is in used at the moment.

BUG=b:344274789
BRANCH=firmware-brya-14505.B
TEST=emerge-brya coreboot chromeos-bootimage

Change-Id: Id4dc74c4f2a807d2e531b419ecb7b590d4c32ac2
Signed-off-by: YH Lin <yueherngl@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82945
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>

src/mainboard/google/brya/Kconfig

@@ -550,6 +550,7 @@ config BOARD_GOOGLE_XIVU
 
 config BOARD_GOOGLE_XOL
 	select BOARD_GOOGLE_BASEBOARD_BRYA
+	select CHROMEOS_WIFI_SAR if CHROMEOS
 	select DRIVERS_I2C_DA7219
 	select DRIVERS_INTEL_ISH
 	select SOC_INTEL_RAPTORLAKE

src/mainboard/google/brya/variants/xol/Makefile.mk

@@ -4,3 +4,4 @@ bootblock-y += gpio.c
 romstage-y += memory.c
 ramstage-y += gpio.c
 ramstage-y += ramstage.c
+ramstage-$(CONFIG_FW_CONFIG) += variant.c

src/mainboard/google/brya/variants/xol/overridetree.cb

@@ -3,6 +3,10 @@ fw_config
 		option STORAGE_UFS			0
 		option STORAGE_NVME			1
 	end
+	field WIFI_SAR_ID 31
+		option WIFI_SAR_ID_0			0
+		option WIFI_SAR_ID_1			1
+	end
 end
 
 chip soc/intel/alderlake

src/mainboard/google/brya/variants/xol/variant.c

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <baseboard/variants.h>
+#include <chip.h>
+#include <fw_config.h>
+#include <sar.h>
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	return "wifi_sar_0.hex";
+}