iio: tsl2772: add support for avago,apds9930

The Avago APDS9930 has the same register set as the TAOS/AMS TSL2772 so
this patch adds the correct bindings and the appropriate LUX table
values derived from the values in the datasheet. Driver was tested on a
LG Nexus 5 (hammerhead) phone.

avago,apds9930 datasheet:
https://www.mouser.com/datasheet/2/678/avago_AV02-3190EN_DS_APDS-9930_2014-03-25[1]-1217273.pdf

tsl2772 datasheet:
https://ams.com/eng/content/download/291503/1066377/file/TSL2772_DS000181_2-00.pdf

Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>