ASoC: intel/skl/hda - fix probe regression on systems without i915

Starting in commit cbc7a6b5a87a ("ASoC: soc-card: add
snd_soc_card_add_dai_link()"), error value from ASoc add_dai_link() is
no longer ignored.

The generic HDA machine driver relied on the old semantics to disable
i915 HDMI/DP audio codec at runtime. If no display codec was present,
add_dai_link() returned an error, but this was ignored and rest of the
card was successfully probed.

Fix the problem by changing the machine driver add_dai_link() to not
return an error in this case.

Fixes: cbc7a6b5a87a ("ASoC: soc-card: add snd_soc_card_add_dai_link()")
Signed-off-by: Kai Vehmanen <[email protected]>
Reviewed-by: Pierre-Louis Bossart <[email protected]>
Reviewed-by: Rander Wang <[email protected]>
Reviewed-by: Guennadi Liakhovetski <[email protected]>
BugLink: https://github.com/thesofproject/linux/issues/2261
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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