arm64: dts: renesas: r8a774e1: Add I2C and IIC-DVFS support

Add the I2C[0-6] and IIC Bus Interface for DVFS (IIC for DVFS)
devices nodes to the r8a774e1 device tree.

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/1594811350-14066-14-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com


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