boards: renesas: Initial support DAC driver for Renesas RA

Add support DAC driver for 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

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