ALSA: hda - Add GPIO1 control at muting with HP laptops

HP laptops with AD1984A codecs (at least mobile models) need to set
GPIO1 appropriately to indicate the mute state.  The BIOS checks this
bit to judge whether the mute on or off is sent via F8 key.
Without changing this bit, the BIOS can be confused and may toggle
the mute wrongly.

Reference: Novell bnc#515266
	https://bugzilla.novell.com/show_bug.cgi?id=515266

Signed-off-by: Takashi Iwai <tiwai@suse.de>