lenovo: Make version look like something thinkpad_acpi would accept

thinkpad_acpi checks that BIOS version matches some pattern.
Report version in this form.

Not cleaned up as the idea of this patch seems to be met with resistance.
Can make it Thinkpad-specific if the idea is accepted.

Change-Id: I15e33e87e7a7f42d6a06f12fb39b5172153af8a1
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4650
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
diff --git a/src/include/smbios.h b/src/include/smbios.h
index 0ab074d..7c41c42 100644
--- a/src/include/smbios.h
+++ b/src/include/smbios.h
@@ -19,6 +19,7 @@
 const char *smbios_mainboard_serial_number(void);
 const char *smbios_mainboard_version(void);
 void smbios_mainboard_set_uuid(u8 *uuid);
+const char *smbios_mainboard_bios_version(void);
 
 #define BIOS_CHARACTERISTICS_PCI_SUPPORTED  (1 << 7)
 #define BIOS_CHARACTERISTICS_PC_CARD  (1 << 8)