mfd: Use mfd cell platform_data for wl1273 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.

Cc: Matti Aaltonen <matti.j.aaltonen@nokia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/sound/soc/codecs/wl1273.c b/sound/soc/codecs/wl1273.c
index c8a874d..5836201 100644
--- a/sound/soc/codecs/wl1273.c
+++ b/sound/soc/codecs/wl1273.c
@@ -441,8 +441,7 @@
 
 static int wl1273_probe(struct snd_soc_codec *codec)
 {
-	struct wl1273_core **core =
-			mfd_get_data(to_platform_device(codec->dev));
+	struct wl1273_core **core = codec->dev->platform_data;
 	struct wl1273_priv *wl1273;
 	int r;