arm64: dts: renesas: Add support for MIPI Adapter V2.1 connected to HiHope RZ/G2N

Add support for AISTARVISION MIPI Adapter V2.1 board connected to HiHope
RZ/G2N board.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20201020125134.22625-5-prabhakar.mahadev-lad.rj@bp.renesas.com


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