[kv2019i]

Here's patchset to move from hdac-hdmi to snd-hda-codec-hdmi to implement HDMI/DP support.
Two machine drivers (UP^2 with Hifiberry and generic HDA-audio) are updated as example.

Related patch to topology to align the PCM interface with legacy driver: TBD -> topology changes not needed after all

Implements #1123
Implements #1078
Fixes #1104
Fixes #1077
Fixes #1375

Event log:

• V8 (WW44.2) v8 sent to alsa-devel -- a few more comments + sparse warnings
• V7 (WW43.3) v7 sent to alsa-devel -- addressing Takashi's feedback on inline functions, rebased on Mark's tree
• V6 (WW41.5) v6 sent to alsa-devel -- fixes [ICL] Resume from S3 fails with snd-hda-codec-hdmi #1263
• V5 (WW39.3) v5 sent to alsa-devel -- fixed issue on ICL
• V4 (WW37.4) v4 sent to alsa-devel -- addressed feedback to V3, fix to ICL support
• V3 (WW37.2) v3 sent to alsa-devel -- addressed feedback to V2, extended series to cover all SOF/HDMI machine drivers, various smaller cleanups
• V2 (WW35.5) v2 sent to alsa-devel -- implemented runtime selection of driver selection to support distribution kernels; various bugfies
• V1/rc4 (WW35.4) added chmap support; patch sent upstream to alsa-devel
• prelist-rc3 (WW35.3) dynamically parse PCM ids from topology at probe; multiple clean ups
• prelist-rc2 (WW35.2) v2 patchset, added a mechanism to pass PCM device numbers from machine driver to HDA codec driver; lots of cleanups; tested with PA12.2; added support for skl-hda-generic-dsp
• prelist-rc1 (WW34): initial patchset

Currently tested:

• eld procfs is working with SOF
• single-monitor playback is working
• playback to different monitors is working (HDMI and DP)
• concurrent playback to two monitors (HDMI+DP)
• concurrent playback to three monitors (HDMI + 2xDP in MST mode)
• jack detection works (as expected by e.g. Pulseaudio)
• jack detection works without changing topology with Pulseaudio 12.x and newer

Open issues list: NONE, no open issues left

• higher rate of failures on ICL in regression test -> fixed with V5 series WW39 and display driver patches WW40
• concept of backup/virtual PCMs used by "dyn-pcm-assign" mode of hda-codec-hdmi does not work well with ASoC, SOF and topology
• how do we pass the "SOF mode" info to hda-codec-hdmi? new hda-codec flag added
• chmap ctl registration is broken
• naming of some entities should be revisioted (e.g. get rid of the "hifiX" names) -> fixed in v2
• plan needed how/which machine drivers to update (on need basis, or move over all)
• compatibility of machine drivers with SST driver
• test legacy driver works with the patch_hdmi.c modifications in this set