tests/functional: Move m68k tests into architecture specific folder

The tests/functional folder has become quite crowded, thus move the
m68k tests into a target-specific subfolder.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20250819112403.432587-13-thuth@redhat.com>
8 files changed