tests: drivers: pwm: Add support for pwm tests on ek_ra8m2

Add support for test apps on Renesas ek_ra8m2:
- tests/drivers/pwm_api
- tests/drivers/pwm_loopback

Signed-off-by: Khoa Nguyen <khoa.nguyen.xh@renesas.com>
Signed-off-by: Khoa Tran <khoa.tran.yj@bp.renesas.com>
2 files changed