Add the VIN, CSI-2 and CSISP related nodes found on R-Car V4M.

One thing to note is that both CSISP0 and CSISP1 are in the same power
domain, this is different from other Gen4 SoCs (R-Car V4H).  The reason
for this is that R-Car V4M only has one ISP core which is connected to
CSISP0 while R-Car V4H has two ISP cores, one connected to each CSISP.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20240527134129.1695450-2-niklas.soderlund+renesas@ragnatech.seSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>