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

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.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>