tests: drivers: dac: Add support to test DAC on RA devices

Add support ek_ra8m1, ek_ra8d1, mck_ra8t1, ek_ra6m5,
ek_ra6m4, ek_ra6m3, ek_ra6m2, ek_ra6m1, ek_ra6e2,
fpb_ra6e2, fpb_ra6e1, ek_ra4m3, ek_ra4m2, ek_ra4e2,
ek_ra2a1 to test:
- zephyr/tests/drivers/dac/dac_api
- zephyr/tests/drivers/dac/dac_loopback (except ek_ra2a1)

Signed-off-by: Khoa Nguyen <khoa.nguyen.xh@renesas.com>