crypto: octeontx* - Select CRYPTO_AUTHENC

Select CRYPTO_AUTHENC as the function crypto_authenec_extractkeys
may not be available without it.

Fixes: 311eea7e ("crypto: octeontx - Fix authenc setkey")
Fixes: 7ccb750d ("crypto: octeontx2 - Fix authenc setkey")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409042013.gT2ZI4wR-lkp@intel.com/


Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>