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.com


Signed-off-by: Mark Brown <broonie@kernel.org>