As the key length of xts(aes) is different with other mode of aes,
so we should check specially in cryptodev_builtin_get_aes_algo, if
it is xts mode.

Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>