Export board-status info.

Rather than hunting version across compile tree in board_status,
export it by coreboot itself.

Change-Id: I7f055e6fc077134001ebdb11df7381bbdc71a1fc
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6747
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/include/boot/coreboot_tables.h

@@ -140,6 +140,14 @@ struct lb_string {
 	uint8_t  string[0];
 };
 
+#define LB_TAG_VERSION_TIMESTAMP	0x0026
+struct lb_timestamp {
+	uint32_t tag;
+	uint32_t size;
+	uint32_t timestamp;
+};
+
+
 /* 0xe is taken by v3 */
 
 #define LB_TAG_SERIAL		0x000f