mfd: Use mfd cell platform_data for 88pm860x 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: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Liam Girdwood <lrg@slimlogic.co.uk>
Cc: Richard Purdie <rpurdie@rpsys.net>
Acked-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
index c8b520e..c04b94d 100644
--- a/drivers/video/backlight/88pm860x_bl.c
+++ b/drivers/video/backlight/88pm860x_bl.c
@@ -16,7 +16,6 @@
 #include <linux/fb.h>
 #include <linux/i2c.h>
 #include <linux/backlight.h>
-#include <linux/mfd/core.h>
 #include <linux/mfd/88pm860x.h>
 
 #define MAX_BRIGHTNESS		(0xFF)
@@ -168,7 +167,6 @@
 	struct pm860x_backlight_pdata *pdata = NULL;
 	struct pm860x_backlight_data *data;
 	struct backlight_device *bl;
-	struct mfd_cell *cell;
 	struct resource *res;
 	struct backlight_properties props;
 	unsigned char value;
@@ -181,10 +179,7 @@
 		return -EINVAL;
 	}
 
-	cell = pdev->dev.platform_data;
-	if (cell == NULL)
-		return -ENODEV;
-	pdata = cell->mfd_data;
+	pdata = pdev->dev.platform_data;
 	if (pdata == NULL) {
 		dev_err(&pdev->dev, "platform data isn't assigned to "
 			"backlight\n");