layout: Introduce layout_next()

Also, a `layout.c` internal version mutable_layout_next() that
allows to modify layout entries.

Use the new functions where applicable and the code is not
dropped later in this train, and also to compare the layouts
in flashrom_layout_read_from_ifd() in depth.

flashrom-stable: Dropped _layout_entry_by_name()

Change-Id: I284958471c61344d29d92c95d88475065a9ca9aa
Signed-off-by: Nico Huber <nico.h@gmx.de>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/33542
Original-Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Original-Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Original-Reviewed-by: Peter Marheine <pmarheine@chromium.org>
Original-Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72211
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
3 files changed