crypto: crypto4xx - Remove unused declaration crypto4xx_free_ctx()

This function is never implemented and used since introduction in
commit 049359d6 ("crypto: amcc - Add crypt4xx driver").
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/amcc/crypto4xx_core.h

@@ -149,7 +149,6 @@ struct crypto4xx_alg {
 
 int crypto4xx_alloc_sa(struct crypto4xx_ctx *ctx, u32 size);
 void crypto4xx_free_sa(struct crypto4xx_ctx *ctx);
-void crypto4xx_free_ctx(struct crypto4xx_ctx *ctx);
 int crypto4xx_build_pd(struct crypto_async_request *req,
 		       struct crypto4xx_ctx *ctx,
 		       struct scatterlist *src,