rammus: get cbfs sar table name based on the sku id

This patch overrides the get_wifi_sar_cbfs_filename()
to return different sar table according to the sku id.

BUG=b:173465272
TEST=checked bios log and the correct sar table was loaded.

Change-Id: Ia30d760b1a029197d470818c73bfd2c00514652d
Signed-off-by: Zhuohao Lee <zhuohao@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51413
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/poppy/variants/rammus/mainboard.c

@@ -4,6 +4,7 @@
 #include <ec/google/chromeec/ec.h>
 #include <smbios.h>
 #include <string.h>
+#include <sar.h>
 
 #define SKU_UNKNOWN     0xFFFFFFFF
 
@@ -29,3 +30,17 @@ const char *smbios_system_sku(void)
 
 	return sku_str;
 }
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	const char *filename = NULL;
+	uint32_t sku_id;
+
+	sku_id = variant_board_sku();
+	if (sku_id & 0x200)
+		filename = "wifi_sar-shyvana.hex";
+	else
+		filename = "wifi_sar-leona.hex";
+
+	return filename;
+}