iio: light: veml6030: add support for veml7700

iio: light: veml6030: add support for veml7700

The veml7700 contains the same sensor as the veml6030 in a different
package with no interrupt line and no pin to select the I2C address.

To handle the lack of the interrupt line and profit from the existing
support for the veml6030, add a specific iio_chan_spec with no
(num_)event_spec(s), and register the device's info from the
veml6030_info_no_irq struct.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20241007-veml7700-v1-3-fb85dd839d63@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>