ASoC: fix codec breakage caused by the volsw/volsw_2r merger

By accident few places still uses the _2r calls from
the core.
This is a quick fix, the drivers using the old callbacks
going to be changed.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

include/sound/soc.h

@@ -393,6 +393,8 @@ int snd_soc_get_volsw(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol);
 int snd_soc_put_volsw(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol);
+#define snd_soc_get_volsw_2r snd_soc_get_volsw
+#define snd_soc_put_volsw_2r snd_soc_put_volsw
 int snd_soc_info_volsw_s8(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_info *uinfo);
 int snd_soc_get_volsw_s8(struct snd_kcontrol *kcontrol,