ASoC: rsnd: Refactor port handling with helper for endpoint node selection

Refactor the code responsible for selecting the correct device node for
audio endpoint parsing in the rsnd driver. A new helper function
`rsnd_pick_endpoint_node_for_ports()` is introduced to handle the
selection of the endpoint node by checking whether the port is named
'port' or 'ports'.

This change simplifies the logic in both `rsnd_dai_of_node()` and
`rsnd_dai_probe()` functions by replacing repetitive condition checks
with the new helper.

Suggested-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Lad Prabhakar <[email protected]>
Acked-by: Kuninori Morimoto <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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