CMake: Add copyright blurbs to our cmake files

Change-Id: I7bd7c8d9f193fdebc9ccd2a04d7b8cfb3ab4963d
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by:  Alexey Edelev <alexey.edelev@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

cmake/QtSortModuleDependencies.cmake

@@ -1,3 +1,6 @@
+# Copyright (C) 2024 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
 # The script produces the list of qt submodules that are required to build the submodules listed
 # in the QT_BUILD_SUBMODULES variable. The resulting list preserves the required build order.
 # Usage:

cmake/QtSynchronizeRepo.cmake

@@ -1,3 +1,6 @@
+# Copyright (C) 2024 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
 # This script is to be called (ideally from a git-sync-to alias script):
 #     cmake -DSYNC_TO_MODULE="$1" -DSYNC_TO_BRANCH="$2" -P cmake/QtSynchronizeRepo.cmake
 # Or as follows (ideally from a git-qt-foreach alias script):