kernel: ocf: add missing kernel dependencies

OCF_CRYPTOSOFT uses both symbols form crypto_hash and crypto_blkcipher,
so let it select these through kernel config.

Fixes the following build error:

ERROR: "crypto_alloc_ahash" [crypto/ocf/cryptosoft.ko] undefined!
ERROR: "crypto_ahash_digest" [crypto/ocf/cryptosoft.ko] undefined!
ERROR: "crypto_ahash_setkey" [crypto/ocf/cryptosoft.ko] undefined!
make[6]: *** [__modpost] Error 1
make[5]: *** [modules] Error 2

Reported-by: Russell Senior <russell@personaltelco.net>
Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37652 3c298f89-4303-0410-b956-a3cf2f4a3e73