Use SPDX 3.0 license identifier
SPDX released version 3 of their license list (https://spdx.org/licenses/),
which changed the FSF licenses to explicitly end in -only or -or-later
instead of relying on an easy to miss + symbol.
Bug: T183858
Change-Id: I8a86cd48588cd006cdb82f2505ce5e47e558dbf2