x25519 requires quite a bit more stack size (1696/2048), so
increase its size.
BRANCH=none
BUG=b:38486828
TEST=Flash hammer, ./usb_updater2 -c always reports the same
device public key, and authenticator is correct.
Change-Id: I51dff9f10167d654561ef7f199b9b9206511b7e9
Reviewed-on: https://chromium-review.googlesource.com/532476
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
a9364ca5d4