arm64: dts: renesas: rzg3e-smarc-som: Add I2C2 device pincontrol

Add a device node for I2C2 pincontrol.  Also enable the I2C2 device node
with 1MHz clock frequency as it is connected to the RAA215300 PMIC on
the RZ/G3E SoM.

Signed-off-by: John Madieu <john.madieu.xa@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250329121258.172099-2-john.madieu.xa@bp.renesas.com


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