ASoC: atmel: atmel_ssc_dai: Drop S24_LE support due to single channel limitation

ASoC: atmel: atmel_ssc_dai: Drop S24_LE support due to single channel limitation

Drop S24_LE format because it is not supported if more than 2 channels
(of TDM slots) are used. This limitation makes it impractical for use cases
requiring more than 2 TDM slots, leading to potential issues in
multi-channel configurations.

[andrei.simion@microchip.com: Reword the commit title and the commit
message. Add code comment to explain the removed code.]

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Andrei Simion <andrei.simion@microchip.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://patch.msgid.link/20240916131910.22680-3-andrei.simion@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>