smbios: add a family id in smbios type1 family

mosys will use this field to identify system

BRANCH=none
BUG=chromium:359155
TEST=build ok, use dmidecode to check whether data is
     written correctly

Change-Id: I461215c012b6ad712b3f813a3928e90a23bf54f1
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Original-Commit-Id: 7adbdab761cd7b4bda0a43e7b1c4070de26f150a
Original-Change-Id: Icfbd4c61fc49a9cb3d3ecd2b622339957963150c
Original-Signed-off-by: Kane Chen <kane.chen@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/217400
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
Original-Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: http://review.coreboot.org/9230
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/include/smbios.h b/src/include/smbios.h
index 7d1c333..c6132ec 100644
--- a/src/include/smbios.h
+++ b/src/include/smbios.h
@@ -40,6 +40,9 @@
 void smbios_mainboard_set_uuid(u8 *uuid);
 const char *smbios_mainboard_bios_version(void);
 u8 smbios_mainboard_enclosure_type(void);
+#ifdef CONFIG_MAINBOARD_FAMILY
+const char *smbios_mainboard_family(void);
+#endif
 
 #define BIOS_CHARACTERISTICS_PCI_SUPPORTED  (1 << 7)
 #define BIOS_CHARACTERISTICS_PC_CARD  (1 << 8)