arm64: dts: renesas: rzg2lc-smarc-som: Enable PMIC and built-in RTC

Enable PMIC RAA215300 and the built-in RTC on the RZ/G2LC SMARC
EVK.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230712151342.82690-1-biju.das.jz@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>