Driver core: Make platform_device_add_data accept a const pointer

platform_device_add_data() makes a copy of the data that is given to it,
and thus the parameter can be const.  This removes a warning when data
from get_property() on powerpc is handed to platform_device_add_data(),
as get_property() returns a const pointer.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 0338289..f9c903b 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -212,7 +212,7 @@
  *	pointer.  The memory associated with the platform data will be freed
  *	when the platform device is released.
  */
-int platform_device_add_data(struct platform_device *pdev, void *data, size_t size)
+int platform_device_add_data(struct platform_device *pdev, const void *data, size_t size)
 {
 	void *d;