boards: renesas: Add I2C support for Renesas RA4, RA2 boards

Add I2C support for: ek_ra4w1, ek_ra4m2, ek_ra4m3, ek_ra2a1

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