arm64: dts: renesas: r8a774a1: Add VIN and CSI-2 nodes

Add VIN and CSI-2 nodes to RZ/G2M SoC dtsi.

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>