staging: iio: ad5933: add SPDX identifier

Add SPDX identifier of GPL-2.0 for the ad5933 driver.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Marcelo Schmitt 2019-03-16 12:07:03 -03:00 • committed by Jonathan Cameron
commit adb0ef4120