arm64: dts: renesas: Add support for MIPI Adapter V2.1 connected to HiHope RZ/G2H

Add support for AISTARVISION MIPI Adapter V2.1 board connected to HiHope
RZ/G2H board.

Common file hihope-rzg2-ex-aistarvision-mipi-adapter-2.1.dtsi is created
which will be used by RZ/G2{HMN}, by default the CSI20 node is tied to
ov5645 camera endpoint and the imx219 camera endpoint is tied to CSI40.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Acked-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20201020125134.22625-3-prabhakar.mahadev-lad.rj@bp.renesas.com


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