arm64: dts: rockchip: add mipi csi-2 receiver nodes to rk3588

arm64: dts: rockchip: add mipi csi-2 receiver nodes to rk3588

The Rockchip RK3588 features six MIPI CSI-2 receiver units:
 - MIPI0: connected to MIPI DCPHY0 (not supported)
 - MIPI1: connected to MIPI DCPHY1 (not supported)
 - MIPI2: connected to MIPI DPHY0
 - MIPI3: connected to MIPI DPHY0-1 (not supported)
 - MIPI4: connected to MIPI DPHY1
 - MIPI5: connected to MIPI DPHY1-1 (not supported)
As the MIPI DCPHYs as well as the split DPHY mode of the DPHYs are not yet
supported, add only the device tree nodes for the MIPI2 and MIPI4 units.

Signed-off-by: Michael Riesch <michael.riesch@collabora.com>
Link: https://patch.msgid.link/20260305-rk3588-csi2rx-v5-2-3b7061d043ea@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>