Since commit 4005d1ba ("ASoC: soc-dai: don't call PCM audio ops if
the stream is not supported") HDMI playback is broken with avs driver.
This happens because for HDMI stream (unlike generic HDA one)
channels_min for stream is not set when creating PCMs. Fix this by
setting the value based on first available converter.

Fixes: 4005d1ba ("ASoC: soc-dai: don't call PCM audio ops if the stream is not supported")
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Link: https://lore.kernel.org/r/20240112113349.2905328-1-amadeuszx.slawinski@linux.intel.comSigned-off-by: Takashi Iwai <tiwai@suse.de>