crypto: atmel - Forbid 2-key 3DES in FIPS mode

This patch forbids the use of 2-key 3DES (K1 == K3) in FIPS mode.

This patch also removes the bogus CFB 3DES modes that only work
with a short 3DES key not otherwise allowed by the crypto API.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>