ASoC: SOF: topology: Use kmemdup() to replace kzalloc + memcpy

fix memdup.cocci warning:
sound/soc/sof/topology.c:876:19-26: WARNING opportunity for kmemdup

Generated by: scripts/coccinelle/api/memdup.cocci
Signed-off-by: Yihao Han <hanyihao@vivo.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220317093841.3414-1-hanyihao@vivo.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/topology.c

@@ -873,11 +873,10 @@ static int sof_control_load_bytes(struct snd_soc_component *scomp,
 
 	/* copy the private data */
 	if (priv_size > 0) {
-		scontrol->priv = kzalloc(priv_size, GFP_KERNEL);
+		scontrol->priv = kmemdup(control->priv.data, priv_size, GFP_KERNEL);
 		if (!scontrol->priv)
 			return -ENOMEM;
 
-		memcpy(scontrol->priv, control->priv.data, priv_size);
 		scontrol->priv_size = priv_size;
 	}