Customize the NPU samples provided by ST so they can be executed in our DEY images:
- Add a generic launch script to pre-configure environment variables before launching demos.
- Remove 'weston' user check from demos launch scripts.
- Reduce font size for big screens.
- Set camera resolution to 640x480px and center the image.
- Adapt home folder to 'root' user instead of 'weston'.
- Adapt package group to include the new samples and remove the old ones.
- Fix a couple of errors with models download and include them manually.
- Add a runtime dependency with 'libdrm-tests' as the 'modetest' binary is required.
https://onedigi.atlassian.net/browse/CCS-12
Signed-off-by: David Escalona <david.escalona@digi.com>