iio: amplifiers: update license information

Use the new `SPDX-License-Identifier` tag to specify the license.
For ad8366, also update copyright years in the header part.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alexandru Ardelean 2019-05-30 16:18:08 +03:00 • committed by Jonathan Cameron
commit 38ffa3a34c
2 changed files with 3 additions and 3 deletions