Without this file, pulseaudio aborts with:
E: [pulseaudio] alsa-mixer.c: Assertion 'eb = p2->elements' failed at
modules/alsa/alsa-mixer.c:3179, function path_set_condense(). Aborting.
modules/alsa/mixer/paths/analog-input-mic.conf \
modules/alsa/mixer/paths/analog-input-dock-mic.conf \
modules/alsa/mixer/paths/analog-input-front-mic.conf \
+ modules/alsa/mixer/paths/analog-input-headphone-mic.conf \
modules/alsa/mixer/paths/analog-input-internal-mic.conf \
modules/alsa/mixer/paths/analog-input-internal-mic-always.conf \
modules/alsa/mixer/paths/analog-input-rear-mic.conf \