boards: renesas: Add DAC support for Renesas RA4 boards

Add support DAC for Renesas ek_ra4m1, ek_ra4w1, fpb_ra4e1,
voice_ra4e1, ek_ra4l1

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