libpayload: cros: include mac addresses in coreboot table

Pass MAC addresses found in coreboot table into lib_sysinfo.

BUG=chrome-os-partner:32152
TEST=with all changes in place MAC addresses are properly inserted
     into the kernel device tree.

Change-Id: I6b13c1c2c246362256abce3efa4a97b355647ef8
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: e2fe74f86b4ed43eb8a3c9d99055afc5d6fb7b78
Original-Change-Id: I1d0bd437fb27fabd14b9ba1fb5415586cd8847bb
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/219444
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/8751
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/payloads/libpayload/include/coreboot_tables.h b/payloads/libpayload/include/coreboot_tables.h
index 53b5890..13a9978 100644
--- a/payloads/libpayload/include/coreboot_tables.h
+++ b/payloads/libpayload/include/coreboot_tables.h
@@ -224,6 +224,18 @@
 	uint32_t index;
 };
 
+#define CB_TAG_MAC_ADDRS       0x0026
+struct mac_address {
+	uint8_t mac_addr[6];
+	uint8_t pad[2];         /* Pad it to 8 bytes to keep it simple. */
+};
+
+struct cb_macs {
+	uint32_t tag;
+	uint32_t size;
+	uint32_t count;
+	struct mac_address mac_addrs[0];
+};
 
 #define CB_TAG_CMOS_OPTION_TABLE 0x00c8
 struct cb_cmos_option_table {