tests: kernel: tickless: Add support for RZ/G3S-SMARC

Add test support for System Timer driver of RZ/G3S-SMARC

Signed-off-by: Nhut Nguyen <nhut.nguyen.kc@renesas.com>
Signed-off-by: Hoang Nguyen <hoang.nguyen.jx@bp.renesas.com>