Add a .clang-format configuration and mention it in the coding guidelines.
Usage example:
$ clang-format -i **/*.[ch]
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>