ARM: dts: r8a7742: Add I2C and IIC support

Add the I2C[0-3] and IIC[0-3] device nodes to the R8A7742 device tree.

Automatic transmission for PMIC control is not available on IIC3 hence
compatible strings "renesas,rcar-gen2-iic" and "renesas,rmobile-iic" are
not added to iic3 node.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Link: https://lore.kernel.org/r/1589555337-5498-4-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com


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