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

Bobba would prefer to use different SAR values per sku-id for regulatory
compliance. This commit uses the newly added interface for custom wifi
SAR CBFS filenames.

CQ-DEPEND=CL:*729429
BUG=b:120958726
BRANCH=octopus
TEST=build

Signed-off-by: Justin TerAvest <teravest@chromium.org>

Change-Id: I354382d651d65d533459f0ca460ca6fd6de547fd
Reviewed-on: https://review.coreboot.org/c/30223
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/mainboard/google/octopus/variants/bobba/Makefile.inc

@@ -1,3 +1,4 @@
 bootblock-y += gpio.c
 
 ramstage-y += gpio.c
+ramstage-y += mainboard.c

src/mainboard/google/octopus/variants/bobba/mainboard.c

@@ -0,0 +1,36 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <boardid.h>
+#include <ec/google/chromeec/ec.h>
+#include <sar.h>
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	const char *filename = NULL;
+	uint32_t sku_id;
+	if (google_chromeec_cbi_get_sku_id(&sku_id))
+		return NULL;
+
+	switch (sku_id) {
+	case 9:
+	case 10:
+	case 11:
+	case 12:
+		filename = "wifi_sar-bobba360.hex";
+		break;
+	}
+	return filename;
+}