cbfs: Remove deprecated APIs

This patch removes all remaining pieces of the old CBFS API, now that
the last straggling use cases of it have been ported to the new one
(meaning cbfs_map()/cbfs_load()/etc... see CB:39304 and CB:38421).

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I1cec0ca2d9d311626a087318d1d78163243bfc3c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59682
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>

tests/lib/cbfs-verification-test.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <cbfs.h>
+#include <commonlib/bsd/cbfs_private.h>
 #include <commonlib/region.h>
 #include <string.h>
 #include <tests/lib/cbfs_util.h>