bloblist: Drop BSD license

Linaro has decided to write their own version of bloblist from scratch,
so there is no point in having a non-GPL license on this file. Change
it, to better fit with the U-Boot project.

Signed-off-by: Simon Glass <sjg@chromium.org>
Link: https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/22215
Acked-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

common/bloblist.c

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2018 Google, Inc
  * Written by Simon Glass <sjg@chromium.org>

include/bloblist.h

@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause */
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * This provides a standard way of passing information between boot phases
  * (TPL -> SPL -> U-Boot proper.)