iio: add modifiers for A and B ultraviolet light

commit b89710b upstream.

Currently there are only two modifiers for ultraviolet light: a generic
one for any ultraviolet light (IIO_MOD_LIGHT_UV) and one for deep
ultraviolet (IIO_MOD_LIGHT_DUV), which is also referred as ultraviolet
C (UV-C) band and covers short-wave ultraviolet.

There are still no modifiers for the long-wave and medium-wave
ultraviolet bands. These two bands are the main components used to
obtain the UV index on the Earth's surface.

Add modifiers for the ultraviolet A (UV-A) and ultraviolet B (UV-B)
bands.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20231110-veml6075-v3-1-6ee46775b422@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: javiercarrascocruz

include/uapi/linux/iio/types.h

@@ -91,6 +91,8 @@ enum iio_modifier {
 	IIO_MOD_CO2,
 	IIO_MOD_VOC,
 	IIO_MOD_LIGHT_UV,
+	IIO_MOD_LIGHT_UVA,
+	IIO_MOD_LIGHT_UVB,
 	IIO_MOD_LIGHT_DUV,
 	IIO_MOD_PM1,
 	IIO_MOD_PM2P5,