Change in flashrom[master]: layout: Add -i <region>[:<file>] support

[Daniel Campello (Code Review)]

Attention is currently required from: Nico Huber, Nicola Corna, Jack Rosenthal, Paul Menzel, Stefan Reinauer, David Hendricks, Daniel Campello, Arthur Heymans, Carl-Daniel Hailfinger.
Daniel Campello has uploaded a new patch set (#36) to the change originally created by David Hendricks. ( https://review.coreboot.org/c/flashrom/+/23021 )

Change subject: layout: Add -i <region>[:<file>] support
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layout: Add -i <region>[:<file>] support

Add an optional sub-parameter to the -i parameter to allow building the
image to be written from multiple files. This will also allow regions to
be read from flash and written to separate image files.

This is a rebase of a patch that was ported from chromiumos. A lot of
things have changed, but the idea is the same.

Original patch by Louis Yung-Chieh Lo :
Summary: Support -i partition:file feature for both read and write.
Commit: 9c7525f
Review URL: http://codereview.chromium.org/6611015

Ported version by Stefan Tauner 
and Carl-Daniel Hailfinger :
Summary: [PATCH 2/6] layout: Add -i <region>[:<file>] support.
Review URL: https://mail.coreboot.org/pipermail/flashrom/2013-October/011729.html

Change-Id: Ic5465659605d8431d931053967b40290195cfd99
Signed-off-by: David Hendricks 
Signed-off-by: Stefan Tauner 
Signed-off-by: Carl-Daniel Hailfinger 
Signed-off-by: Arthur Heymans 
Signed-off-by: Nico Huber 
Signed-off-by: Edward O'Callaghan 
Signed-off-by: Daniel Campello 
Co-Authored-by: Edward O'Callaghan 
Co-Authored-by: Daniel Campello 
---
M cli_classic.c
M flash.h
M flashrom.8.tmpl
M flashrom.c
M layout.c
M layout.h
6 files changed, 234 insertions(+), 37 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/21/23021/36