ASoC: intel: skl_hda_dsp_common: create HDMI jack kctl

This patch call snd_jack_add_new_kctl() to create the HDMI jack kctls.
Userspace needs these kctls to detect the hdmi monitor hotplug.

In /usr/share/alsa/ucm, the config file needs to assign a jack kctl to
"JackControl" to let PA get the jack hotplug status.
Signed-off-by: Libin Yang <libin.yang@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190808192734.18286-1-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/skl_hda_dsp_common.c

@@ -147,6 +147,11 @@ int skl_hda_hdmi_jack_init(struct snd_soc_card *card)
 		if (err)
 			return err;
 
+		err = snd_jack_add_new_kctl(pcm->hdmi_jack.jack,
+					    jack_name, SND_JACK_AVOUT);
+		if (err)
+			dev_warn(component->dev, "failed creating Jack kctl\n");
+
 		err = hdac_hdmi_jack_init(pcm->codec_dai, pcm->device,
 					  &pcm->hdmi_jack);
 		if (err < 0)