ALSA: hda - Rearrange INPUT_PIN_ATTR_*

Put INPUT_PIN_ATTR_FRONT after INPUT_PIN_ATTR_REAR, and define
INPUT_PIN_ATTR_LAST to point to the last element.

This is a preliminary work for cleaning up Realtek auto-mic parser.
In the auto-mic implementation, the front panel is preferred over the
rear panel.  By arranging the attr definitions like in this commit, we
can simply use sort() for figuring out the priority order.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_auto_parser.c b/sound/pci/hda/hda_auto_parser.c
index d460688..44c81d3 100644
--- a/sound/pci/hda/hda_auto_parser.c
+++ b/sound/pci/hda/hda_auto_parser.c
@@ -363,7 +363,7 @@
 {
 	unsigned int def_conf;
 	static const char * const mic_names[] = {
-		"Internal Mic", "Dock Mic", "Mic", "Front Mic", "Rear Mic",
+		"Internal Mic", "Dock Mic", "Mic", "Rear Mic", "Front Mic"
 	};
 	int attr;