iio: light: tsl2563: Drop legacy platform data code

There is no in-kernel user for legacy platform data.
Otherwise, a new one can use software nodes instead.
Hence, drop legacy platform data code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Ferry Toth <ftoth@exalondelft.nl>
Link: https://lore.kernel.org/r/20221207190348.9347-7-andriy.shevchenko@linux.intel.com


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