RK3568 VICAP support

This is a prerequisite step for the upcoming work on the RK3588 VICAP, since the same (or at least similar enough) building blocks are used for both VICAP variants. Support for the RK3568 has already been discussed on the list, in fact, the v5 of patch series "media: rockchip: add a driver for the rockchip camera interface" has been on the list for some weeks now and finally got some in-depth review.

TODO

• Implement requested changes (overall fixes, add documentation, DT binding magic, ...) and submit v6
• Prepare and send out v7
• Address krzk's comments.
• Fix error found by the kernel test robot.
• Integrate fixes from RK3588 enablement.
• Revise crop. Set CROP start and width/height registers correctly. (Should be fine)
• Rebase onto v6.16-rc1 once it has been tagged.
• Prepare and send out v8.
• Prepare v11 and split up the large driver patch into several patches.
• Test v11 on WolfVision Visualizer (RK3568 DVP), ROCK3A + IMX219 (?, Mehdi has issues with that setup), ROCK5B+ + IMX415
• Hope for the best