chromeos: move VPD MAC address retrieval function

Retrieval of the MAC address from the VPD is a Chrome OS specific
feature, required just on one platform so far. There is no need to
look for the MAC address in the VPD on all other Chrome OS boards.

BRANCH=storm
BUG=chromium:417117
TEST=with the upcoming patch applied verified that MAC addresses still
     show up in the device tree on storm

Change-Id: If5fd4895bffc758563df7d21f38995f0c8594330
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: fb4906ac559634321a01b4814f338611b9e98b2b
Original-Change-Id: I8e6f8dc38294d3ab11965931be575360fd12b2fc
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/223796
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/9398
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/include/boot/coreboot_tables.h

@@ -366,6 +366,12 @@ void lb_add_console(uint16_t consoletype, void *data);
 /* Define this in mainboard.c to add board-specific table entries. */
 void lb_board(struct lb_header *header);
 
+/*
+ * Function to retrieve MAC address(es) from the VPD and store them in the
+ * coreboot table.
+ */
+void lb_table_add_macs_from_vpd(struct lb_header *header);
+
 struct lb_record *lb_new_record(struct lb_header *header);
 
 #endif /* COREBOOT_TABLES_H */