boards: renesas: Add ADC support for Renesas RZ/A3UL, T2M, N2L, V2L

Add ADC support for board Renesas RZ/A3UL-SMARC,
RZ/T2M-RSK, RZ/N2L-RSK, RZ/V2L-SMARC

Signed-off-by: Phuc Pham <phuc.pham.xr@bp.renesas.com>
Signed-off-by: Tien Nguyen <tien.nguyen.zg@renesas.com>