BugLink: http://bugs.launchpad.net/bugs/1556228

Just like CX20722, CX7024 codec also requires the power down at reboot
in order to reduce the noise at reboot/shutdown.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=113511
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
(cherry picked from commit 56dc66ff)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>