iio: move LIGHT_UVA and LIGHT_UVB to the end of iio_modifier

iio: move LIGHT_UVA and LIGHT_UVB to the end of iio_modifier

The new modifiers should have added to the end of the enum, so they do
not affect the existing entries.

No modifiers were added since then, so they can be moved safely to the
end of the list.

Move IIO_MOD_LIGHT_UVA and IIO_MOD_LIGHT_UVB to the end of iio_modifier.

Fixes: b89710bd215e ("iio: add modifiers for A and B ultraviolet light")
Suggested-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20240127200208.185815-1-javier.carrasco.cruz@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>