Edward O'Callaghan uploaded patch set #2 to this change.

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spi: Allow cached ID bytes to be cleared

This does two things:
1. Removes the static variables from various ID functions and moves
   them to a single struct.
2. Adds a function to clear the struct.

The idea of the original caching mechanism introduced years ago was
simply to speed up probe_flash() by not issuing the same read ID
commands dozens or hundreds of times for a single chip.

That implementation assumed that we would only call probe_flash()
once. However, there are cases when we want to call probe_flash()
multiple times, for example, if using an external programmer and
using different voltages (for probing the chip).

This patch is extremely similar to the original works of:
 `commit 57b7524b1448189d3630d6c4735e60dbbdf14d51`.
 Author: David Hendricks <dhendrix@chromium.org>
&&
 `commit 7f7c711ee1a41649607f81f1533e5135fc1361fc`.
 Author: David Hendricks <dhendrix@chromium.org>

BUG=b:15656443
BRANCH=none
TEST=none

Change-Id: I879cb08dbe66db9ab0c3b8a7f93b04fe1c5980f4
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
---
M spi.h
M spi25.c
2 files changed, 51 insertions(+), 28 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/99/41399/2

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