ASoC: ak4613: return error if it was setup as clock provider

Renesas is only user of ak4613 on upstream, and it is tested
only under "clock consumer" because of board mounting situation.

Thus, "clock provider" is not supperted/tested.
This patch return error if it was setup as clock provider.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87czhwp9lq.wl-kuninori.morimoto.gx@renesas.com


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