ALSA: hda - Fix inverted LED gpio setup for Lenovo Ideapad

We implemented in a wrong way for mute LED on Lenovo Ideapad; the bit
must be flipped.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=16373
Fixes: 3e887f379d8a ('ALSA: hda - Add mute LED support to Lenovo Ideapad')
Cc: <stable@vger.kernel.org> # 3.15+
Signed-off-by: Takashi Iwai <tiwai@suse.de>
ALSA: Update control names documentation

This document was not really up-to-date. Add recent additions to this
standard - based on what the HDA driver currently does, which is some
kind of a de facto standard.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Merge branch 'for-next'
Merge branch 'for-linus'