[ALSA] hda-codec - Small clean up and fixes

Modules: HDA Codec driver,HDA generic driver

- Common labels for input pins
- Fix and clean up of Realtek codec parsers

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index a9863eb..c82d2a7 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -211,6 +211,8 @@
 	AUTO_PIN_LAST
 };
 
+extern const char *auto_pin_cfg_labels[AUTO_PIN_LAST];
+
 struct auto_pin_cfg {
 	int line_outs;
 	hda_nid_t line_out_pins[5]; /* sorted in the order of Front/Surr/CLFE/Side */