ASoC: dapm - add DAPM macro for external enum widgets

Add a convenience macro for external enumerated widgets.
Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

include/sound/soc-dapm.h

@@ -266,6 +266,12 @@
 	.get = snd_soc_dapm_get_enum_virt, \
 	.put = snd_soc_dapm_put_enum_virt, \
 	.private_value = (unsigned long)&xenum }
+#define SOC_DAPM_ENUM_EXT(xname, xenum, xget, xput) \
+{	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
+	.info = snd_soc_info_enum_double, \
+	.get = xget, \
+	.put = xput, \
+	.private_value = (unsigned long)&xenum }
 #define SOC_DAPM_VALUE_ENUM(xname, xenum) \
 {	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
 	.info = snd_soc_info_enum_double, \