[M] Change in flashrom[master]: flashrom: Use WP-based unlocking on opaque masters

[Nikolai Artemiev (Code Review)]

Attention is currently required from: Anastasia Klimchuk, Sergii Dmytruk.

Hello build bot (Jenkins), Edward O'Callaghan, Anastasia Klimchuk, Sergii Dmytruk,

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

https://review.coreboot.org/c/flashrom/+/74930

to look at the new patch set (#4).

Change subject: flashrom: Use WP-based unlocking on opaque masters
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flashrom: Use WP-based unlocking on opaque masters

Flashrom only tries to use WP-based unlocking if it detects that WP
operations are supported. However WP support was detected in a way that
ignored WP operations provided by opaque masters.

This stopped flashrom from automatically unlocking with some opaque
masters, particularly linux_mtd.

This commit also deletes part of a test that required the chip unlock
function to be called before read/write/erase operations because WP
unlocking is now used instead of chip unlocking.

BUG=b:280111380
BRANCH=none
TEST=Checked flashrom automatically unlocked flash on strongbad (MTD)

Change-Id: I1774ad64d82ae47cd085df6045e17e283855c01f
Signed-off-by: Nikolai Artemiev 
---
M flashrom.c
M include/flash.h
M spi25_statusreg.c
M tests/chip.c
4 files changed, 28 insertions(+), 42 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/30/74930/4