ASoC: sgtl5000: Fix up define for SGTL5000_SMALL_POP

Currently, below code actually does not update any bit because
SGTL5000_SMALL_POP is 0.

snd_soc_update_bits(codec, SGTL5000_CHIP_REF_CTRL, SGTL5000_SMALL_POP, 1);

The SGTL5000_SMALL_POP should be BIT(0) rather than 0, fix it.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-By: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/sgtl5000.h

@@ -275,7 +275,7 @@
 #define SGTL5000_BIAS_CTRL_MASK			0x000e
 #define SGTL5000_BIAS_CTRL_SHIFT		1
 #define SGTL5000_BIAS_CTRL_WIDTH		3
-#define SGTL5000_SMALL_POP			0
+#define SGTL5000_SMALL_POP			1
 
 /*
  * SGTL5000_CHIP_MIC_CTRL