Bug#1074441: linux-image-amd64: Please enable several CONFIG_ options required for IPU6/MIPI cameras

[Marten van Kerkwijk <mhvk@astro.utoronto.ca>]

Hi,

Upon further testing, I got things to work!

1. One needs libcamera-0.3.1-2, otherwise simpleimage is not enabled;

2. libcamera requires DMAHEAP, so beyond the settings mentioned above,
   one also has to enable DMABUF_HEAPS (and possibly DMABUF_HEAPS_SYSTEM
   options; I just set bot to y);

3. To use the camera as a regular user (not root), one needs a version
   of systemd that includes 
   https://github.com/systemd/systemd/pull/33738/files
   (not yet in Debian).  One can just edit the relevant file.

Note that, as mentioned above, sometimes the ov2740 module does not get
initialized properly and one has to reload it.  Furthermore, the camera
also does not always get initialized properly if using qcam; one has to
stop and start capture a few times.

Hope this helps others too,

Marten