16-bit digital color sensor with red, green, blue and clear channel

datasheet: http://ams.com/eng/content/download/250258/975997/TCS3414_Datasheet_EN_v1.pdfSigned-off-by: NPeter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>