ALSA: jack - Add "Line In" input jack constants

Similar to Line Out, these constants form the base for future
patches enabling input jack reporting for Line in jacks.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index e3db196..8b046a1 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -5264,6 +5264,8 @@
 		return "Mic";
 	case SND_JACK_LINEOUT:
 		return "Line-out";
+	case SND_JACK_LINEIN:
+		return "Line-in";
 	case SND_JACK_HEADSET:
 		return "Headset";
 	case SND_JACK_VIDEOOUT: