Kconfig: Remove BOARD_ID_MANUAL option

The BOARD_ID_MANUAL and BOARD_ID_STRING options were introduced for the
Urara board which is now long dead, and have never been used anywhere
else. They were trying to do something that we usually handle with a
separate SKU ID these days, whereas BOARD_ID is supposed to be reserved
for different revisions of the same board/SKU. Get rid of it to make
further refactoring of other options easier.

Also shove some stuff back into the Urara mainboard that should've never
crept into generic headers.

Change-Id: I4e7018066eadb38bced96d8eca2ffd4f0dd17110
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/22694
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/lib/coreboot_table.c

@@ -246,7 +246,7 @@ static inline void lb_vboot_handoff(struct lb_header *header) {}
 
 static void lb_board_id(struct lb_header *header)
 {
-#if IS_ENABLED(CONFIG_BOARD_ID_AUTO) || IS_ENABLED(CONFIG_BOARD_ID_MANUAL)
+#if IS_ENABLED(CONFIG_BOARD_ID_AUTO)
 	struct lb_board_id  *bid;
 
 	bid = (struct lb_board_id *)lb_new_record(header);