lib/math/int_log: Replace LGPL-2.1-or-later boilerplate with SPDX identifier

lib/math/int_log: Replace LGPL-2.1-or-later boilerplate with SPDX identifier

Replace license boilerplate in udftime.c with SPDX identifier for
LGPL-2.1-or-later.

Acked-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lore.kernel.org/r/20230619172019.21457-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230703135211.87416-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>