crypto: sun8i-ss - Remove prepare/unprepare request

The callbacks for prepare and unprepare request in crypto_engine
is superfluous.  They can be done directly from do_one_request.

Move the code into do_one_request and remove the unused callbacks.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c

@@ -409,8 +409,6 @@ int sun8i_ss_cipher_init(struct crypto_tfm *tfm)
 	       CRYPTO_MAX_ALG_NAME);
 
 	op->enginectx.op.do_one_request = sun8i_ss_handle_cipher_request;
-	op->enginectx.op.prepare_request = NULL;
-	op->enginectx.op.unprepare_request = NULL;
 
 	err = pm_runtime_resume_and_get(op->ss->dev);
 	if (err < 0) {

drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c

@@ -120,8 +120,6 @@ int sun8i_ss_hash_crainit(struct crypto_tfm *tfm)
 	op->ss = algt->ss;
 
 	op->enginectx.op.do_one_request = sun8i_ss_hash_run;
-	op->enginectx.op.prepare_request = NULL;
-	op->enginectx.op.unprepare_request = NULL;
 
 	/* FALLBACK */
 	op->fallback_tfm = crypto_alloc_ahash(crypto_tfm_alg_name(tfm), 0,