[M] Change in flashrom[main]: WIP: erasure_layout: Fix get_flash_region bug

[Nikolai Artemiev (Code Review)]

Attention is currently required from: Aarya.

Hello Aarya,

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

https://review.coreboot.org/c/flashrom/+/81385?usp=email

to look at the new patch set (#2).

Change subject: WIP: erasure_layout: Fix get_flash_region bug
......................................................................

WIP: erasure_layout: Fix get_flash_region bug

This effectively exchanges the nesting of the loops over erase blocks
and flash regions.

Old:
 - Select erasefns
 - Loop over blocks to erase for each selected erasefn
  - Loop over programmer flash regions within erase block
    - Erase regions (may fail since selected erasefn will be
      too big if flash region is smaller than erase block)

New:
 - Loop over programmer flash regions within erase block
   - Select erasefns within programer flash region
     - Loop over blocks to erase for each selected erasefn
     - Erase regions

Eraser selection and erasing has also been factored out into a helper
function to manage nesting depth.

TEST=builds
BUG=none
BRANCH=none

Change-Id: I5d8492351a1ac5832227cbdbe40dea7b9ac3abd1
Signed-off-by: Nikolai Artemiev 
---
M erasure_layout.c
1 file changed, 102 insertions(+), 92 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/85/81385/2