vboot: Deprecate VBSD_EC_SLOW_UPDATE

Replace VbSharedDataHeader flag VBSD_EC_SLOW_UPDATE with compile-time
macro EC_SLOW_UPDATE.

BRANCH=none
BUG=chromium:1038259
TEST=FEATURES=test emerge-nami vboot_reference

Cq-Depend: chromium:1985549
Change-Id: I0f5e04f2b6cf088ab8373ade580bc294ba18e290
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1985547
Reviewed-by: Joel Kitching <kitching@chromium.org>
3 files changed