crypto: authenc - Add Kconfig dependency on CRYPTO_NULL
crypto: authenc - Add Kconfig dependency on CRYPTO_NULL

CRYPTO_AUTHENC needs to depend on CRYPTO_NULL as authenc uses
null for copying.

Reported-by: Reported-by: Fengguang Wu <24f7fe9d205c8a9f6ade0c2894e14303ca16087f@intel.com>
Signed-off-by: Herbert Xu <ef65de1c7be0aa837fe7b25ba9a7739905af6a55@gondor.apana.org.au>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs