iio:dac:ad5686: Change license description

Add GPLv2+ SPDX identifier and remove license notice to keep the whole
purpose of using an SPDx id.

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Stefan Popa 2018-04-11 14:52:12 +03:00 • committed by Jonathan Cameron
commit 16a3c17575