ASoC: mchp-spdifrx: remove struct mchp_spdifrx_dev::fmt member

Remove member fmt of struct mchp_spdifrx_dev as it is not used anywhere.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20230130120647.638049-7-claudiu.beznea@microchip.com


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