ASoC: Intel: skl_hda_dsp_generic: Drop HDMI routes when HDMI is not available

When the HDMI is not present due to disabled display support
we will use dummy codec and the HDMI routes will refer to non existent
DAPM widgets.

Trim the route list from the HDMI routes to be able to probe the card even
if the HDMI dais are not registered.

Signed-off-by: Peter Ujfalusi <[email protected]>
Reviewed-by: Bard Liao <[email protected]>
Reviewed-by: Kai Vehmanen <[email protected]>
Reviewed-by: Pierre-Louis Bossart <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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