commit 42304474 upstream.

This makes the mute LED work on a HP 15 touchsmart machine.

BugLink: https://bugs.launchpad.net/bugs/1334950Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>