ASoC: siu: don't use discriminatory terms for parameter

siu is using discriminatory terms for function parameter.
This patch changes it to "secondary"

One note here is that it do nothing to DMA related naming
for now, because it needs framework level modification.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87d04z3qqg.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/siu_pcm.c

@@ -281,11 +281,11 @@ static int siu_pcm_stmread_stop(struct siu_port *port_info)
 	return 0;
 }
 
-static bool filter(struct dma_chan *chan, void *slave)
+static bool filter(struct dma_chan *chan, void *secondary)
 {
-	struct sh_dmae_slave *param = slave;
+	struct sh_dmae_slave *param = secondary;
 
-	pr_debug("%s: slave ID %d\n", __func__, param->shdma_slave.slave_id);
+	pr_debug("%s: secondary ID %d\n", __func__, param->shdma_slave.slave_id);
 
 	chan->private = &param->shdma_slave;
 	return true;