UPSTREAM: ASoC: rt5616: add missing mute control for HPVOL

Add missing kcontrol for HPVOL mute control.

Signed-off-by: John Lin <john.lin@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Bug: 25923642

(cherry picked from git.kernel.org broonie/sound.git for-next
 commit d7fcd13663fe43ad938fec1acd46ff196dddf914)
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Change-Id: I75951c4b67474951e6c033e0dece5134c51dc233
1 file changed