ASoC: rsnd: tidyup SSI parent related function/macro names

Current rsnd driver is using SSI parent related function/macro as
"clock" related. but it is not only clock related.
tidyup function/macro naming.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>