common: fsl: Fix broken SPDX-License-Identifier change

This bug was introduced by:
"Add GPL-2.0+ SPDX-License-Identifier to source files"
(sha1: 1a4596601fd395f3afb8f82f3f840c5e00bdd57a)

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
1 file changed