vboot: simplify ec_sync code to only handle one device

Remove devidx argument from internal and external functions.
Rename external API functions to vboot2 scheme (vb2ex_...).
Rename external EC-related data types to vboot2 scheme (vb2_...).

BUG=b:124141368, chromium:1016688, chromium:1017093, b:112198832, b:143094352
TEST=make clean && make runtests
BRANCH=none

Cq-Depend: chromium:1910562
Change-Id: I4ca9858a0f91a0365288c04cdb90aad0efdd7647
Signed-off-by: Joel Kitching <kitching@google.com>
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1872255
Reviewed-by: Julius Werner <jwerner@chromium.org>
8 files changed