zephyr test: SYV682x: Use zassume
zephyr test: SYV682x: Use zassume

Replace zassert_* with zassume_* where the failure in question would be
outside the scope of the containing test. Use zassume_* to validate
results of _setup and _after functions.

BUG=b:234886404
TEST=zmake testall
BRANCH=none

Signed-off-by: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@chromium.org>
Change-Id: I615384d382ba2bd06ba1873fbb01bb914d3b9b07
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3689788
Reviewed-by: Aaron Massey <79529a820df71f45023239a3663736629646cc34@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec