mb/google/nissa/var/anraggar: add hook for WiFi SAR table

As a preparation for WiFi SAR table addition, adding hook for it.

BRANCH=nissa
BUG=b:315418153
TEST=emerge-nissa coreboot

Cq-Depend: chrome-internal:6790137
Change-Id: Idb200699bb8c8581b9512ec8ec9442f65f8822b3
Signed-off-by: Jianeng Ceng <cengjianeng@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79730
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>

src/mainboard/google/brya/Kconfig

@@ -508,6 +508,7 @@ config BOARD_GOOGLE_ANRAGGAR
 	select DRIVERS_INTEL_MIPI_CAMERA
 	select HAVE_WWAN_POWER_SEQUENCE
 	select DRIVERS_GFX_GENERIC
+	select CHROMEOS_WIFI_SAR if CHROMEOS
 
 if BOARD_GOOGLE_BRYA_COMMON
 

src/mainboard/google/brya/variants/anraggar/Makefile.inc

@@ -4,3 +4,5 @@ bootblock-y += gpio.c
 romstage-y += gpio.c
 
 ramstage-y += gpio.c
+
+ramstage-y += variant.c

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

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <sar.h>
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	return "wifi_sar_2.hex";
+}