iio: light: tsl2563: Use dev_get_drvdata() directly in PM callbacks

PM callbacks take struct device pointer as a parameter, use
dev_get_drvdata() to retrieve it instead of unneeded double
loop of referencing via i2c_get_clientdata(to_i2c_client(dev)).
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Ferry Toth <ftoth@exalondelft.nl>
Link: https://lore.kernel.org/r/20221207190348.9347-9-andriy.shevchenko@linux.intel.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/light/tsl2563.c

@@ -795,7 +795,7 @@ static void tsl2563_remove(struct i2c_client *client)
 
 static int tsl2563_suspend(struct device *dev)
 {
-	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct tsl2563_chip *chip = iio_priv(indio_dev);
 	int ret;
 
@@ -814,7 +814,7 @@ static int tsl2563_suspend(struct device *dev)
 
 static int tsl2563_resume(struct device *dev)
 {
-	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct tsl2563_chip *chip = iio_priv(indio_dev);
 	int ret;