crypto: cavium - Remove the individual encrypt/decrypt function for each algorithm

Remove the individual encrypt/decrypt function for easch algorithm.
This is in prepration of adding more crypto algorithms supported by
hardware. While at that simplify create_ctx_hdr/create_input_list
function interfaces.

Signed-off-by: George Cherian <george.cherian@cavium.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>