mb/g/drallion: Override smbios enclosure type for drallion

Drallion can be either a clamshell or convertible depending on the
presence of the 360 sensor board. Set the smbios type 3 enclosure type
to either CONVERTIBLE or LAPTOP accordingly.

BUG=b:143701965
TEST='dmidecode -t 3'
     Type = Convertible with sensor board connected
     Type = Laptop with sensor board disconnected

Change-Id: I766e9a4b22a490bc8252670a06504437e82f72d5
Signed-off-by: Mathew King <mathewk@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36512
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/drallion/variants/drallion/Makefile.inc

@@ -32,3 +32,4 @@ verstage-y += gpio.c
 romstage-y += memory.c
 
 ramstage-y += sku.c
+ramstage-y += smbios.c

src/mainboard/google/drallion/variants/drallion/smbios.c

@@ -0,0 +1,24 @@
+/*
+ * 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 <smbios.h>
+#include <variant/variant.h>
+
+smbios_enclosure_type smbios_mainboard_enclosure_type(void)
+{
+	return has_360_sensor_board() ?
+	       SMBIOS_ENCLOSURE_CONVERTIBLE :
+	       SMBIOS_ENCLOSURE_LAPTOP;
+}