staging: iio: add TAOS tsl2x7x driver

TAOS device driver (version 9) for the tsl/tmd 2771 and 2772 device families (inc. all variants).

Update:
Removed bonus lines.

Signed-off-by: Jon Brenner <jbrenner@taosinc.com>
Acked-by: Jonathan <Cameron&lt;jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>