ASoC: rsnd: enable clk_i approximate rate usage

Basically Renesas sound ADG is assuming that it has accurately
divisible input clock. But sometimes / some board might not have it.
The clk_i from CPG is used for such case. It can't calculate accurate
division, but can be used as approximate rate.
This patch enable clk_i for such case.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Adnan Ali <adnan.ali@bp.renesas.com>
Tested-by: Vincenzo De Michele <vincenzo.michele@davinci.de>
Tested-by: Patrick Keil <patrick.keil@conti-engineering.com>
Link: https://lore.kernel.org/r/87msyizlfd.wl-kuninori.morimoto.gx@renesas.com


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