iio: light: gp2ap020a00f: Explicitly use string literal for driver name

iio: light: gp2ap020a00f: Explicitly use string literal for driver name

The driver name should be easily greppable and clearly spelled.
Replace a level of indirection and explicitly use string literal.

While at it, remove useless blank lines before module_*() and
MODULE_*() macros.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Ethan Tidmore <ethantidmore06@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>