mbedtls: use correct SPDX License Identifier and add License file

License "GPL-2.0+" is deprecated License Identifier according to
SPDX License list [1]. The correct one is GPL-2.0-or-later.
While at it, also add the License file.

[1] https://spdx.org/licenses/

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
This commit is contained in:
Josef Schlehofer 2020-02-22 23:03:37 +01:00 committed by Hauke Mehrtens
parent 36af1967f5
commit 8fe9daf775