arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Add parent macro for each sensor

arm64: dts: renesas: aistarvision-mipi-adapter-2.1: Add parent macro for each sensor

For HiHope RZ/G2H the OV5645 sensor is populated on i2c2 whereas the imx219
sensor is populated on i2c3 so add support for handling such cases by
adding a parent macro for each sensor.

Also update r8a774c0-ek874-mipi-2.1.dts to incorporate the changes.

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/20201020125134.22625-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>