ASoC: atmel-i2s: Set symmetric sample bits

The I2S needs to have the same sample bits for both capture and playback
streams.

Fixes: b543e467 ("ASoC: atmel-i2s: add driver for the new Atmel I2S controller")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Link: https://lore.kernel.org/r/20210618150741.401739-1-codrin.ciubotariu@microchip.com


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