mfd: Use mfd cell platform_data for davinci cells platform bits

With the addition of a platform device mfd_cell pointer, MFD drivers
can go back to passing platform 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: Miguel Aguilar <miguel.aguilar@ridgerun.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

sound/soc/davinci/davinci-vcif.c

@@ -205,7 +205,7 @@ static struct snd_soc_dai_driver davinci_vcif_dai = {
 
 static int davinci_vcif_probe(struct platform_device *pdev)
 {
-	struct davinci_vc *davinci_vc = mfd_get_data(pdev);
+	struct davinci_vc *davinci_vc = pdev->dev.platform_data;
 	struct davinci_vcif_dev *davinci_vcif_dev;
 	int ret;