eCryptfs: Use the ablkcipher crypto API

Make the switch from the blkcipher kernel crypto interface to the
ablkcipher interface.

encrypt_scatterlist() and decrypt_scatterlist() now use the ablkcipher
interface but, from the eCryptfs standpoint, still treat the crypto
operation as a synchronous operation. They submit the async request and
then wait until the operation is finished before they return. Most of
the changes are contained inside those two functions.

Despite waiting for the completion of the crypto operation, the
ablkcipher interface provides performance increases in most cases when
used on AES-NI capable hardware.

Signed-off-by: Tyler Hicks <[email protected]>
Acked-by: Colin King <[email protected]>
Reviewed-by: Zeev Zilberman <[email protected]>
Cc: Dustin Kirkland <[email protected]>
Cc: Tim Chen <[email protected]>
Cc: Ying Huang <[email protected]>
Cc: Thieu Le <[email protected]>
Cc: Li Wang <[email protected]>
Cc: Jarkko Sakkinen <[email protected]>

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