ASoC: sgtl5000: enable VAG_POWER for LINE_IN

LINE_IN also needs VAG_POWER on or we may hear noise when directly
route LINE_IN to Headphone Mux.
Tested on imx28evk.
Signed-off-by: NDong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/sgtl5000.c

@@ -239,6 +239,7 @@ static const struct snd_soc_dapm_route sgtl5000_dapm_routes[] = {
 	{"Headphone Mux", "DAC", "DAC"},	/* dac --> hp_mux */
 	{"LO", NULL, "DAC"},			/* dac --> line_out */
 
+	{"LINE_IN", NULL, "VAG_POWER"},
 	{"Headphone Mux", "LINE_IN", "LINE_IN"},/* line_in --> hp_mux */
 	{"HP", NULL, "Headphone Mux"},		/* hp_mux --> hp */