flashchips: Add MXU12835F support

Ported from:
https://mail.coreboot.org/pipermail/flashrom/2017-September/015123.html

BUG=none
BRANCH=none
TEST=compiled only

Change-Id: I65d0f701939b4784e82000d78d28ac2476e18987
Signed-off-by: David Hendricks <david.hendricks@gmail.com>
Reviewed-on: https://chromium-review.googlesource.com/753007
Commit-Ready: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Wei-Ning Huang <wnhuang@chromium.org>
3 files changed