crypto: sl3516 - 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/gemini/sl3516-ce-cipher.c

@@ -336,8 +336,6 @@ int sl3516_ce_cipher_init(struct crypto_tfm *tfm)
 		 crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm)));
 
 	op->enginectx.op.do_one_request = sl3516_ce_handle_cipher_request;
-	op->enginectx.op.prepare_request = NULL;
-	op->enginectx.op.unprepare_request = NULL;
 
 	err = pm_runtime_get_sync(op->ce->dev);
 	if (err < 0)