camera_v2: Restore stock camera_v2 code

* Rename camera_v2 -> camera_v2_fortuna

* Use separate headers for different camera_v2 code to allow
  all the camera code to work as intended without weird quirks.

* Remove camera_v2_gte directory and restore stock camera_v2 code.

 This is is a squash of the following commits:

    42adaf61 camera_v2: Use separate headers for diffrent camera_v2 dirs
    3daa5f57 camera_v2: Restore stock camera_v2
    ac3e9899 camera_v2: Remove gte camera_v2 dir
    fc1321ee camera_v2: Rename camera_v2 directory