Revert "crypto: talitos - convert to use be16_add_cpu()"

Revert "crypto: talitos - convert to use be16_add_cpu()"

This reverts commit 3da54acec97e617e2633f89333d8dc94b367a916.

The conversion to be16_add_cpu() is incorrect in case cryptlen is
negative due to premature (i.e. before addition / subtraction)
implicit conversion of cryptlen (int -> u16) leading to sign loss.

Cc: <stable@vger.kernel.org> # 3.10+
Cc: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Horia Geanta <horia.geanta@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>