config: re-modularize CRYPTO_{CTS,ECB,XTS} on arm* (bsc#1189034).
    
    Now that FS_ENCRYPTION_ALGS is modular, the crypto modules it utilizes
    can be modular as well.  CRYPTO_AES and CRYPTO_CBC are used by
    ENCRYPTED_KEYS and must remain built-in.  CRYPTO_SHA512 and CRYPTO_HMAC
    are used by module signature validation and must also remain built-in.