layout: Introduce get_default_layout()

Containing an included, full-flash-chip sized default region.
This allows us to query the default layout specifically, also
if an additional layout is attached to the flash context.

Change-Id: Ia343e9775ec5bdc3fea5cdb6b347298515996e34
Signed-off-by: Nico Huber <nico.h@gmx.de>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/33519
Original-Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Original-Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Original-Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Original-Reviewed-by: Peter Marheine <pmarheine@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72215
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2 files changed