mfd: Use mfd cell platform_data for wm8400 cells platform bits

With the addition of a platform device mfd_cell pointer, MFD drivers
can go back to passing platform data back to their sub drivers.
This allows for an mfd_cell->mfd_data removal and thus keep the
sub drivers MFD agnostic. This is mostly needed for non MFD aware
sub drivers.

Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/wm8400-core.c b/drivers/mfd/wm8400-core.c
index 3a6e78c..597f82e 100644
--- a/drivers/mfd/wm8400-core.c
+++ b/drivers/mfd/wm8400-core.c
@@ -245,7 +245,8 @@
 {
 	struct mfd_cell cell = {
 		.name = "wm8400-codec",
-		.mfd_data = wm8400,
+		.platform_data = wm8400,
+		.pdata_size = sizeof(*wm8400),
 	};
 
 	return mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0);