linux-yocto: Fix patch format to be 'git am' compatible

Split the reuse header in its own file to avoid confusing git am and
forcing the build system to other means of applying the patch.

Fixes: https://git.ostc-eu.org/OSTC/OHOS/meta-ohos/-/issues/99



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

meta-ohos-core/recipes-kernel/linux/linux/fix-gcc-plugins-with-gcc-11.patch

-SPDX-FileCopyrightText: Huawei Inc.
-SPDX-License-Identifier: Apache-2.0
-
 From bernhard.rosenkraenzer.ext@huawei.com Tue Jul 13 21:23:14 2021
 From: Bernhard Rosenkraenzer <bernhard.rosenkraenzer.ext@huawei.com>
 Date: Tue, 13 Jul 2021 21:23:14 +0100

meta-ohos-core/recipes-kernel/linux/linux/fix-gcc-plugins-with-gcc-11.patch.license

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0