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Add support to configure HDA controller with external codec even if iDisp codec in i915 is not available.
This can happen for multiple reasons:
- internal graphics is disabled on the system
- i915 driver is not enabled in kernel or it fails to init
- i915 codec reports error in HDA codec probe
- HDA codec driver probe fails
Address all these scenarios, but keep using the same topology configuration still. In case failures occur, HDMI PCM nodes are created, but they will report error at open. No ALSA mixer controls are created.
Fixes: #1658
Note to @plbossart : this will conflict with "ASoC: SOF: Intel: refactor i915_get/put functions" that was sent to upstream last week. In case merging get delayed, you'll see this.