[flashrom-gerrit] Change in flashrom[staging]: Add a convenient libflashrom interface

[Nico Huber (Code Review)]

Hello build bot (Jenkins),

I'd like you to reexamine a change.  Please visit

https://review.coreboot.org/17946

to look at the new patch set (#3).

Change subject: Add a convenient libflashrom interface
......................................................................

Add a convenient libflashrom interface

This adds a minimal libflashrom interface based on the draft in the
wiki. While the glue code in libflashrom.c is build on top of the
existing code instead on overhauling it, the interface in libflashrom.h
is supposed to be stable. So we can keep the interface and adapt
internals later if favoured, without breaking clients.

A new make target, libinstall, is also added. It installs libflashrom.a
and libflashrom.h in lib/ and include/ dirs respectively.

This commit breaks build of the cli. It will be fixed with a follow-up
commit.

v2: Rebase and fixes by Anton Kochkov.

v3: o fl_image_*() rewritten with layout support (touch only included regions).
    o Moved read/erase/write/verify operations to flashrom.c.
    o Added layout pointer and flags to the flash context.

Change-Id: I00f169990830aa17b7dfae5eb74010d40c476181
Signed-off-by: Nico Huber 
---
M Makefile
M flash.h
M flashrom.c
A libflashrom.c
A libflashrom.h
5 files changed, 694 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/46/17946/3