crypto: zynqmp - 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/xilinx/zynqmp-aes-gcm.c

@@ -316,8 +316,6 @@ static int zynqmp_aes_aead_init(struct crypto_aead *aead)
 	tfm_ctx->dev = drv_ctx->dev;
 
 	tfm_ctx->engine_ctx.op.do_one_request = zynqmp_handle_aes_req;
-	tfm_ctx->engine_ctx.op.prepare_request = NULL;
-	tfm_ctx->engine_ctx.op.unprepare_request = NULL;
 
 	tfm_ctx->fbk_cipher = crypto_alloc_aead(drv_ctx->alg.aead.base.cra_name,
 						0,