ASoC: Enable WM8990 ADC clocking workaround

Enable a hardware workaround which avoids problems with the clocking of
the ADCs in certain configurations.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/wm8990.h b/sound/soc/codecs/wm8990.h
index 0e192f3..7114ddc 100644
--- a/sound/soc/codecs/wm8990.h
+++ b/sound/soc/codecs/wm8990.h
@@ -80,8 +80,8 @@
 #define WM8990_PLL3                             0x3E
 #define WM8990_INTDRIVBITS			0x3F
 
-#define WM8990_REGISTER_COUNT                   60
-#define WM8990_MAX_REGISTER                     0x3F
+#define WM8990_EXT_ACCESS_ENA			0x75
+#define WM8990_EXT_CTL1				0x7a
 
 /*
  * Field Definitions.