atomisp staging driver changes for 6.6

Highlights:
- Complete #ifdef ISP2401 removal work (Kate Hsuan),
  no more CONFIG_VIDEO_ATOMISP_ISP2401. Instead a single build
  now works on both the ISP2400(BYT) and ISP2401(CHT)!
- The ACPI DSDT -> v4l2-subdev fwnode translation code (ipu-bridge) is
  now shared with the IPU3 code (already merged through Sakari's tree)
- Drop the atomisp-ov2680 driver, instead the main ov2680 driver
  can now be used (already merged through Sakari's tree)
- Drop the atomisp-ov5693 driver, instead the main ov5693 driver
  can now be used
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