crypto: octeontx2 - Use swap() instead of swap_engines()

Fix the following coccicheck warning:

./drivers/crypto/marvell/octeontx2/otx2_cptpf_ucode.c:1523:16-17:
WARNING opportunity for swap().

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>