iio: light: tsl2772: Make use of device properties

Convert the module to be property provider agnostic and allow
it to be used on non-OF platforms.

While at it, reuse temporary device pointer in the same function.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220413181402.19582-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>