crypto: engine: fix linux-next merge conflict

crypto: engine: fix linux-next merge conflict

A merge conflict between the akpm-current tree and the crypto tree
caused a build failure in ARM allmodconfig today:

crypto/crypto_engine.c: In function 'crypto_transfer_hash_request':
crypto/crypto_engine.c:234:3: error: implicit declaration of function 'queue_kthread_work' [-Werror=implicit-function-declaration]

This adapts the crypto code to the API change.

Fixes: 4cba7cf025f3 ("crypto: engine - permit to enqueue ashash_request")
Fixes: 8ca76638a2d0 ("kthread: kthread worker API cleanup")
Link: http://lkml.kernel.org/r/20160908135724.1311726-1-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>