ASoC: rsnd: setup clock-out only when all conditions are right

Current adg.c doesn't assume that requested clock out divide condition
doesn't match. In such case, it will indicate strange message, and will
register NULL clock, etc. It is just a DT setting miss, but is
confusable. This patch check all conditions for it.

Reported-by: Vincenzo De Michele <vincenzo.michele@davinci.de>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87lee2zlf7.wl-kuninori.morimoto.gx@renesas.com


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