mfd: Add placeholders for WM8350 client devices

In order to avoid merge problems further down the line add placeholders
for several of the WM8350 client devices and register them, otherwise
the patches adding the client devices will all try to update the same
code.

Also remove redundant checks for null regulator platform devices while
we're at it.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Samuel Ortiz <sameo@openedhand.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/include/linux/mfd/wm8350/gpio.h b/include/linux/mfd/wm8350/gpio.h
index c6cd2ca..ed91e8f 100644
--- a/include/linux/mfd/wm8350/gpio.h
+++ b/include/linux/mfd/wm8350/gpio.h
@@ -13,6 +13,8 @@
 #ifndef __LINUX_MFD_WM8350_GPIO_H_
 #define __LINUX_MFD_WM8350_GPIO_H_
 
+#include <linux/platform_device.h>
+
 /*
  * GPIO Registers.
  */
@@ -328,6 +330,10 @@
 int wm8350_gpio_config(struct wm8350 *wm8350, int gpio, int dir, int func,
 		       int pol, int pull, int invert, int debounce);
 
+struct wm8350_gpio {
+	struct platform_device *pdev;
+};
+
 /*
  * GPIO Interrupts
  */