Input: update SPDX tag for input-event-codes.h

Replace the
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
with
/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */

to help coreboot community consume this file without relaxing their
licensing checks.

Signed-off-by: Rajat Jain <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>

Author: Rajat Jain

include/uapi/linux/input-event-codes.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
 /*
  * Input event codes
  *