Calculate the proper bclk rate using the number of tdm slots
and the width of the tdm data.

Fixes: 2884c291 ("ASoC: cs530x: Support for cs530x ADCs")
Signed-off-by: Paul Handrigan <paulha@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20240710160416.2617173-1-paulha@opensource.cirrus.comSigned-off-by: Mark Brown <broonie@kernel.org>