sound: Allow audio codecs to be used by other SoCs

At present there is still some samsung-specific code in the audio codecs.
Remove it so that these can be used by other SoCs.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/sound/samsung_sound.c b/drivers/sound/samsung_sound.c
index 84064eb..b695267 100644
--- a/drivers/sound/samsung_sound.c
+++ b/drivers/sound/samsung_sound.c
@@ -10,6 +10,7 @@
 #include <i2s.h>
 #include <sound.h>
 #include <asm/gpio.h>
+#include <asm/arch/power.h>
 
 static int samsung_sound_setup(struct udevice *dev)
 {
@@ -79,6 +80,9 @@
 	debug("Probed sound '%s' with codec '%s' and i2s '%s'\n", dev->name,
 	      uc_priv->codec->name, uc_priv->i2s->name);
 
+	/* Enable codec clock */
+	set_xclkout();
+
 	return 0;
 }