boards: renesas: add support for i2c sci-b driver on Renesas RA boards

Enable support of i2c sci-b driver on these boards: ek_ra8m1,
ek_ra8d1, mck_ra8t1

Signed-off-by: Khoa Tran <khoa.tran.yj@bp.renesas.com>
Signed-off-by: Thao Luong <thao.luong.uw@renesas.com>