kernel: cgroup: Add LGPL-2.1 SPDX license ID to legacy_freezer.c

Add an appropriate SPDX-License-Identifier line to the file,
and remove the GNU boilerplate text.

Signed-off-by: Tim Bird <tim.bird@sony.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tim Bird 2026-01-14 16:22:08 -07:00 • committed by Tejun Heo
commit 84697bf553