platform/chrome: wilco_ec: Platform data shouldn't include kernel.h

Replace with appropriate types.h.

Also there is no need to include device.h, but mutex.h.
For the pointers to unknown structures use forward declarations.

In the *.c files we need to include all headers that provide APIs
being used in the module.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

include/linux/platform_data/wilco-ec.h

@@ -8,8 +8,8 @@
 #ifndef WILCO_EC_H
 #define WILCO_EC_H
 
-#include <linux/device.h>
-#include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
 
 /* Message flags for using the mailbox() interface */
 #define WILCO_EC_FLAG_NO_RESPONSE	BIT(0) /* EC does not respond */
@@ -17,6 +17,10 @@
 /* Normal commands have a maximum 32 bytes of data */
 #define EC_MAILBOX_DATA_SIZE		32
 
+struct device;
+struct resource;
+struct platform_device;
+
 /**
  * struct wilco_ec_device - Wilco Embedded Controller handle.
  * @dev: Device handle.