UPSTREAM: crypto: kdf - silence noisy self-test

Make the kdf_sp800108 self-test only print a message on success when
fips_enabled, so that it's consistent with testmgr.c and doesn't spam
the kernel log with a message that isn't really important.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Bug: 256875295
(cherry picked from commit 790c4c9f)
Change-Id: Icb2c93c0ed51789fd425d36ebcaebf01af6b4c78
Signed-off-by: Eric Biggers <ebiggers@google.com>