ASoC: renesas: rz-ssi: Use only the proper amount of dividers

There is no need to populate the ckdv[] with invalid dividers as that
part will not be indexed anyway. The ssi->audio_mck/bclk_rate should
always be >= 0. While at it, change the ckdv type as u8, as the divider
128 was previously using the s8 sign bit.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Fixes: 03e786bd ("ASoC: sh: Add RZ/G2L SSIF-2 driver")
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20241210170953.2936724-6-claudiu.beznea.uj@bp.renesas.com


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