inclusive: change usage of sanity

Google is working to change its source code to use more inclusive
language. To that end, replace the term "sanity" with inclusive
alternatives.

BUG=b:163883397
BRANCH=None
TEST=grep -ir sanity
TEST=make runtests

Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Change-Id: I708a044d89050c442f14fb11a8ae5e98490d56af
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2353420
Reviewed-by: Julius Werner <jwerner@chromium.org>