regulator: set max8998->dev to &pdev->dev.

max8998->dev is NULL in current implementation, set it to &pdev->dev.

regulator_register() still return success if max8998->dev is NULL,
but rdev->dev.parent will be set to NULL which is incorrect.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/regulator/max8998.c

@@ -557,6 +557,7 @@ static __devinit int max8998_pmic_probe(struct platform_device *pdev)
 	}
 
 	rdev = max8998->rdev;
+	max8998->dev = &pdev->dev;
 	max8998->iodev = iodev;
 	max8998->num_regulators = pdata->num_regulators;
 	platform_set_drvdata(pdev, max8998);