ALSA: hda - Fix HP dv5 mic input

Fix HP dv5 (103c:3603) built-in mic input.

Reference: kernel bug 12440
	http://bugzilla.kernel.org/show_bug.cgi?id=12440

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: stable@kernel.org