ALSA: hda - Introduce snd_hda_get_pin_label()

Create a new helper function snd_hda_get_pin_label() for getting a label
string for both input and output pins.  hda_get_input_pin_label() is
obsoleted by this function, and the callers are replaced appropriately
now by this patch.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/patch_cirrus.c b/sound/pci/hda/patch_cirrus.c
index 2a2d864..34a460b 100644
--- a/sound/pci/hda/patch_cirrus.c
+++ b/sound/pci/hda/patch_cirrus.c
@@ -711,7 +711,7 @@
 		uinfo->value.enumerated.item = spec->num_inputs - 1;
 	idx = spec->input_idx[uinfo->value.enumerated.item];
 	strcpy(uinfo->value.enumerated.name,
-	       hda_get_input_pin_label(codec, cfg->inputs[idx].pin, 1));
+	       snd_hda_get_pin_label(codec, cfg->inputs[idx].pin, NULL));
 	return 0;
 }