crypto: inside-secure - move cipher crypto mode to request context

The cipher direction can be different for requests within the same
transformation context. This patch moves the direction flag from the
context to the request scope.

Signed-off-by: Ofer Heifetz <oferh@marvell.com>
[Antoine: commit message]
Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>