crypto: testmgr - allow ecdsa-nist-p256 and -p384 in FIPS mode

The kernel provides implementations of the NIST ECDSA signature
verification primitives. For key sizes of 256 and 384 bits respectively
they are approved and can be enabled in FIPS mode. Do so.

Signed-off-by: Nicolai Stange <nstange@suse.de>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>