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

Google project name is Bloog.
Bloog is 12-inch LCD.
Blooguard is 14-inch LCD so would prefer to use a different SAR values instead.
Use sku-id to load the SAR values.

BUG=b:135078377
BRANCH=octopus
TEST=build and verify SAR load by sku-id

Change-Id: Id80df28a961eb1f62714558df2b219aa552ecb97
Signed-off-by: Tony Huang <tony-huang@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33935
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

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

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

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

@@ -0,0 +1,36 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 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>
+#include <baseboard/variants.h>
+
+#define SKU_UNKNOWN     0xFFFFFFFF
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	const char *filename = NULL;
+	uint32_t sku_id;
+	sku_id = get_board_sku();
+
+	if (sku_id == SKU_UNKNOWN)
+		return NULL;
+
+	if (sku_id == 49 || sku_id == 50 || sku_id == 51 || sku_id == 52)
+		filename = "wifi_sar-blooguard.hex";
+
+	return filename;
+}