ASoC: dt-bindings: mediatek,mt8188-mt6359: Allow DL_SRC/UL_SRC dai-links

Add DL_SRC_BE and UL_SRC_BE as possible link-names for dai-links. These
DAI back-ends are currently hardcoded in the driver to the
MT6359 codec, but they may still be overridden with dai-links in the
Devicetree to assign them additional codecs or even to make the
dependency to the MT6359 codec explicit and allow device links to probe
the components in the right order and avoid unnecessary probe deferrals.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patch.msgid.link/20241205-genio700-audio-output-v1-4-0e955c78c29e@collabora.com


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