crypto: ecb - Convert from skcipher to lskcipher

This patch adds two different implementations of ECB.  First of
all an lskcipher wrapper around existing ciphers is introduced as
a temporary transition aid.

Secondly a permanent lskcipher template is also added.  It's simply
a wrapper around the underlying lskcipher algorithm.

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