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>

drivers/mfd/wm8400-core.c

@@ -245,7 +245,8 @@ static int wm8400_register_codec(struct wm8400 *wm8400)
 {
 	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);

sound/soc/codecs/wm8400.c

@@ -1378,7 +1378,7 @@ static void wm8400_probe_deferred(struct work_struct *work)
 
 static int wm8400_codec_probe(struct snd_soc_codec *codec)
 {
-	struct wm8400 *wm8400 = mfd_get_data(to_platform_device(codec->dev));
+	struct wm8400 *wm8400 = dev_get_platdata(codec->dev);
 	struct wm8400_priv *priv;
 	int ret;
 	u16 reg;