ASoC: Add support for WM8962 GPIO outputs

The WM8962 features five GPIOs, add support for controlling their output
state via gpiolib.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

sound/soc/codecs/wm8962.h

@@ -181,6 +181,7 @@
 #define WM8962_EQ39                             0x175
 #define WM8962_EQ40                             0x176
 #define WM8962_EQ41                             0x177
+#define WM8962_GPIO_BASE			0x200
 #define WM8962_GPIO_2                           0x201
 #define WM8962_GPIO_3                           0x202
 #define WM8962_GPIO_5                           0x204