mb/google/nissa/var/yavilla: Enable wifi SAR

Enable wifi sar function for yavilla/yavilly/yavijo.
Use the fw_config to separate SAR setting for different wifi card.

BUG=b:286141046
BRANCH=firmware-nissa-15217.B
TEST=build, enabled iwlwifi debug, and check dmesg

Change-Id: I1bd111a734a250df49535a07ef056d5b68fccb33
Signed-off-by: Shon Wang <shon.wang@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75673
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Derek Huang <derekhuang@google.com>

src/mainboard/google/brya/Kconfig.name

@@ -378,6 +378,7 @@ config BOARD_GOOGLE_YAVILLA
 	select DRIVERS_GENERIC_GPIO_KEYS
 	select DRIVERS_INTEL_MIPI_CAMERA
 	select HAVE_WWAN_POWER_SEQUENCE
+	select CHROMEOS_WIFI_SAR if CHROMEOS
 
 config BOARD_GOOGLE_GOTHRAX
 	bool "->  Gothrax"

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

@@ -28,6 +28,15 @@ fw_config
 		option MB_1C			0
 		option MB_1C_2A			1
 	end
+	field WIFI_SAR_ID2 16 19
+		option INTEL_YAVILLA_LTE	0
+		option INTEL_YAVILLA_WIFI	1
+		option INTEL_YAVILLY_LTE	2
+		option INTEL_YAVILLY_WIFI	3
+		option INTEL_YAVIJO_LTE		4
+		option INTEL_YAVIJO_WIFI	5
+		option UNUSED			15
+	end
 end
 
 chip soc/intel/alderlake

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

@@ -4,6 +4,7 @@
 #include <boardid.h>
 #include <device/device.h>
 #include <fw_config.h>
+#include <sar.h>
 
 void variant_devtree_update(void)
 {
@@ -27,3 +28,8 @@ void variant_devtree_update(void)
 		ish->enabled = 0;
 	}
 }
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	return get_wifi_sar_fw_config_filename(FW_CONFIG_FIELD(WIFI_SAR_ID2));
+}