iio: light: noa1305: Add support for NOA1305

This driver adds the initial support for the ON Semiconductor
NOA1305 Ambient Light Sensor.

Originally written by Sergei Miroshnichenko. Found here:
  https://github.com/EmcraftSystems/linux-upstream/commit/196d6cf897e632d2cb82d45484bd7a1bfdd5b6d9



Signed-off-by: Sergei M <fizik1@yandex.com>
Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>