ASoC: audio-graph: move audio_graph_remove() to simple-card-utils.c

audio-graph-card2 can reuse  audio_graph_remove() / asoc_simple_remove().
This patch moves it to simple-card-utils.c.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87y2df3uby.wl-kuninori.morimoto.gx@renesas.com


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