mmc: Use device platform_data to retrieve tmio_mmc platform bits

With the addition of the platform device mfd_cell pointer, we can now
cleanly pass the sub device drivers platform data pointers through the
regular device platform_data one, and get rid of mfd_get_data()

Cc: Ian Molton <spyro@f2s.com>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Philipp Zabel <philipp.zabel@gmail.com>
Acked-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/t7l66xb.c

@@ -170,7 +170,8 @@ static struct mfd_cell t7l66xb_cells[] = {
 		.name = "tmio-mmc",
 		.enable = t7l66xb_mmc_enable,
 		.disable = t7l66xb_mmc_disable,
-		.mfd_data = &t7166xb_mmc_data,
+		.platform_data = &t7166xb_mmc_data,
+		.pdata_size    = sizeof(t7166xb_mmc_data),
 		.num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
 		.resources = t7l66xb_mmc_resources,
 	},