ASoC: dt-bindings: renesas: rsnd: tidyup properties

1) resets/reset-names needs minItems
2) It can use ports, not only port
3) It is not using audio-graph properties

Without this patch, we will get warnings

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87wnrooe2z.wl-kuninori.morimoto.gx@renesas.com


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