spi25: Merge some of spi4ba into spi25

Partial backport of upstream `commit 7e3c81ae71`.

BUG=chromium:478356
BRANCH=none
TEST=still builds

Change-Id: Ie8c229757d05acb15cd84ecf50f12b4cc4b4f59d
Signed-off-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/1667515
Reviewed-by: Stefan Reinauer <reinauer@google.com>
4 files changed