Rpi camera tests fail in core devices with low memory

[fernando79513]

Bug Description

Some raspi devices are now running the camera tests and they are failing because there is no enough memory to run create some picamera MMAL components

Cert-blocker Test Case

• cert-blocker

To Reproduce

run:
checkbox-cli run com.canonical.certification::camera-automated

Expected Result

The following camera tests pass:
camera/multiple-resolution-images-rpi_.*
camera/multiple-resolution-images-rpi-attachment_.*
camera/roundtrip-qrcode_.*

Actual Result

All of them fail because an Out of memory error in picamera

Environment

Testing updated snap: core20
Snap version: 20241206
Snap revision: 2497
Snap channel: beta
Kernel: 5.4.0-1120-raspi
Architecture: armhf
Checkbox version: 4.3.0-dev36

Relevant log output

Resolutions test on device: /dev/vchiq
Images will be written to:
/var/tmp/checkbox-ng/sessions/session_title-2024-12-19T16.02.08.session/session-share

mmal: mmal_vc_component_create: failed to create component 'vc.ril.camera' (1:ENOMEM)
mmal: mmal_component_create_core: could not create component 'vc.ril.camera' (1)
Traceback (most recent call last):
  File "/snap/checkbox/11427/checkbox-runtime/lib/python3.8/site-packages/picamera/camera.py", line 456, in _init_camera
    self._camera = mo.MMALCamera()
  File "/snap/checkbox/11427/checkbox-runtime/lib/python3.8/site-packages/picamera/mmalobj.py", line 2279, in __init__
    super(MMALCamera, self).__init__()
  File "/snap/checkbox/11427/checkbox-runtime/lib/python3.8/site-packages/picamera/mmalobj.py", line 631, in __init__
    mmal_check(
  File "/snap/checkbox/11427/checkbox-runtime/lib/python3.8/site-packages/picamera/exc.py", line 184, in mmal_check
    raise PiCameraMMALError(status, prefix)
picamera.exc.PiCameraMMALError: Failed to create MMAL component b'vc.ril.camera': Out of memory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/nest-z9ztttb2.afff2ecea64d8e296231a322b31c5eff66a357af53d02e68450b06196366454e/camera_test_rpi.py", line 63, in <module>
    sys.exit(main())
  File "/tmp/nest-z9ztttb2.afff2ecea64d8e296231a322b31c5eff66a357af53d02e68450b06196366454e/camera_test_rpi.py", line 59, in main
    return capture()
  File "/tmp/nest-z9ztttb2.afff2ecea64d8e296231a322b31c5eff66a357af53d02e68450b06196366454e/camera_test_rpi.py", line 44, in capture
    with picamera.PiCamera(resolution=res, framerate=fr) as camera:
  File "/snap/checkbox/11427/checkbox-runtime/lib/python3.8/site-packages/picamera/camera.py", line 431, in __init__
    self._init_camera(camera_num, stereo_mode, stereo_decimate)
  File "/snap/checkbox/11427/checkbox-runtime/lib/python3.8/site-packages/picamera/camera.py", line 459, in _init_camera
    raise PiCameraError(
picamera.exc.PiCameraError: Camera is not enabled. Try running 'sudo raspi-config' and ensure that the camera has been enabled.

Additional context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CHECKBOX-1716.

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