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>
diff --git a/include/sound/wm8962.h b/include/sound/wm8962.h
index 9722aac..2b5306c 100644
--- a/include/sound/wm8962.h
+++ b/include/sound/wm8962.h
@@ -15,6 +15,7 @@
 #define WM8962_GPIO_SET 0x10000
 
 struct wm8962_pdata {
+	int gpio_base;
 	u32 gpio_init[WM8962_MAX_GPIO];
 
 	/* Setup for microphone detection, raw value to be written to