jool: Add missing SPDX headers

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-oniro-staging/recipes-connectivity/jool/jool/0001-Build-system-changes-to-be-handled-by-yocto-recipe.patch.license

+SPDX-FileCopyrightText: Huawei Inc.
+
+SPDX-License-Identifier: MIT
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