ASoC: omap: rx51: Use gpio_set_value_cansleep for speaker amp control

Speaker amplifier is controlled by TWL4030 GPIO which may sleep. Therefore
use gpio_set_value_cansleep to get rid of runtime warning that is introduced
after the commit 9c4ba946 and to get a stack trace if ever executing this
code in atomic context.
Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

sound/soc/omap/rx51.c

@@ -146,9 +146,9 @@ static int rx51_spk_event(struct snd_soc_dapm_widget *w,
 			  struct snd_kcontrol *k, int event)
 {
 	if (SND_SOC_DAPM_EVENT_ON(event))
-		gpio_set_value(RX51_SPEAKER_AMP_TWL_GPIO, 1);
+		gpio_set_value_cansleep(RX51_SPEAKER_AMP_TWL_GPIO, 1);
 	else
-		gpio_set_value(RX51_SPEAKER_AMP_TWL_GPIO, 0);
+		gpio_set_value_cansleep(RX51_SPEAKER_AMP_TWL_GPIO, 0);
 
 	return 0;
 }