ASoC: Updates for mchp-spdif(tx/rx)

Merge series from Andrei Simion <andrei.simion@microchip.com>:

This patch set includes two updates for the MCHP SPDIF RX and TX drivers.
The patches remove the interface name from the stream_name, allowing the
interface name and index to be set in the Device Tree (DT) using the
sound-name-prefix string property.