mb/google/octopus: Add custom SAR values for Foob360

Foob360 would prefer to use different SAR values. Since Foob360
sku id is 9.

BUG=b:149362272
BRANCH=octopus
TEST=build

Signed-off-by: peichao.wang <peichao.wang@bitland.corp-partner.google.com>
Change-Id: I8cc5d73629990f19d2c1044debdba4990c54d07e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39424
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marco Chen <marcochen@google.com>

src/mainboard/google/octopus/variants/foob/variant.c

@@ -16,6 +16,7 @@
 #include <baseboard/variants.h>
 #include <soc/pci_devs.h>
 #include <ec/google/chromeec/ec.h>
+#include <sar.h>
 
 #define SKU_UNKNOWN     0xFFFFFFFF
 
@@ -34,3 +35,14 @@ void variant_update_devtree(struct device *dev)
 	if (no_touchscreen_sku(sku_id))
 		touchscreen_i2c_host->enabled = 0;
 }
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	const char *filename = NULL;
+	uint32_t sku_id = SKU_UNKNOWN;
+
+	sku_id = google_chromeec_get_board_sku();
+	if (sku_id == 9)
+		filename = "wifi_sar-foob360.hex";
+	return filename;
+}