boardid: Minor clean up and standardization

Merge the different coreboot table strapping ID structures into one
because they're really just all the same, and I want to add more. Make
the signature of the board_id() function return a uint32_t because
that's also what goes in the coreboot table. Add a printk to the generic
code handling strapping IDs in ramstage so that not every individual
mainboard implementation needs its own print. (In turn, remove one such
print from fsp1_1 code because it's in the way of my next patch.)

Change-Id: Ib9563edf07b623a586a4dc168fe357564c5e68b5
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/22741
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/commonlib/include/commonlib/coreboot_tables.h

@@ -289,18 +289,12 @@ struct lb_x86_rom_mtrr {
 };
 
 #define LB_TAG_BOARD_ID		0x0025
-struct lb_board_id {
-	uint32_t tag;
-	uint32_t size;
-	/* Board ID as retrieved from the board revision GPIOs. */
-	uint32_t board_id;
-};
-
 #define LB_TAG_RAM_CODE		0x0028
-struct lb_ram_code {
+
+struct lb_strapping_id {
 	uint32_t tag;
 	uint32_t size;
-	uint32_t ram_code;
+	uint32_t id_code;
 };
 
 #define LB_TAG_SPI_FLASH	0x0029