lib/bootblock: Add simplified entry with basetime

This allows for minor optimization as num_timestamps becomes
a constant zero for a function with local scope. The loop
with calls to timestamp_add() gets removed from bootblock.

Change-Id: Id230075c0e76fe377b6ea8c8ddf8318e07d29b91
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34972
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/cpu/qemu-x86/bootblock.c

@@ -29,5 +29,5 @@ asmlinkage void bootblock_c_entry_bist(uint64_t base_timestamp, uint32_t bist)
 	}
 
 	/* Call lib/bootblock.c main */
-	bootblock_main_with_timestamp(base_timestamp, NULL, 0);
+	bootblock_main_with_basetime(base_timestamp);
 }