ASoC: TPA6130A2: Make tpa6130a2_power as static

The power for the amplifier should be handled internally
by the tpa6130a2 driver.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/tpa6130a2.c b/sound/soc/codecs/tpa6130a2.c
index 0a6e7b4..6b650c1 100644
--- a/sound/soc/codecs/tpa6130a2.c
+++ b/sound/soc/codecs/tpa6130a2.c
@@ -106,7 +106,7 @@
 		tpa6130a2_i2c_write(i, data->regs[i]);
 }
 
-void tpa6130a2_power(int power)
+static void tpa6130a2_power(int power)
 {
 	struct	tpa6130a2_data *data;
 	u8	val;