crypto: api - Fix boot-up self-test race

crypto: api - Fix boot-up self-test race

During the boot process self-tests are postponed so that all
algorithms are registered when the test starts.  In the event
that algorithms are still being registered during these tests,
which can occur either because the algorithm is registered at
late_initcall, or because a self-test itself triggers the creation
of an instance, some self-tests may never start at all.

Fix this by setting the flag at the start of crypto_start_tests.

Note that this race is theoretical and has never been observed
in practice.

Fixes: adad556efcdd ("crypto: api - Fix built-in testing dependency failures")
Signed-off-by: Herbert Xu <herbert.xu@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>