arm64: dts: renesas: r8a779h0: Add family fallback for CSISP IP

arm64: dts: renesas: r8a779h0: Add family fallback for CSISP IP

The usage of the R-Car V4M CSISP bindings where merged before the
bindings where approved. At that time the family fallback compatible
where not part of the bindings, add them.

Fixes: 2bb78d9fb7c9 ("arm64: dts: renesas: r8a779h0: Add video capture nodes")
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Link: https://lore.kernel.org/20240826144352.3026980-7-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>