ASoC: atmel: mchp-spdiftx: Remove interface name from stream_name

ASoC: atmel: mchp-spdiftx: Remove interface name from stream_name

Remove the interface name from the stream_name. The interface name (and the
index of the interface) can be set in DT using the sound-name-prefix string
property.

[andrei.simion@microchip.com: Adjust the commit title.]

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Andrei Simion <andrei.simion@microchip.com>
Link: https://patch.msgid.link/20240916091056.11910-2-andrei.simion@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>