Fix integrated camera in business-vm

[nesteroff]

Description of changes

The integrated camera is passed to the business-vm through the QEMU options but the hot-plugging service is configured to pass all USB cameras to the chromium-vm. This adds it to the ignore list so that it stays connected to the business-vm.

Fixes SSRCSP-5557.

Checklist for things done

• [x] Summary of the proposed changes in the PR description
• [ ] More detailed description in the commit message(s)
• [x] Commits are squashed into relevant entities - avoid a lot of minimal dev time commits in the PR
• [x] Contribution guidelines followed
• [ ] Ghaf documentation updated with the commit - https://tiiuae.github.io/ghaf/
• [x] PR linked to architecture documentation and requirement(s) (ticket id)
• [x] Test procedure described (or includes tests). Select one or more:
  • [x] Tested on Lenovo X1 x86_64
  • [ ] Tested on Jetson Orin NX or AGX aarch64
  • [ ] Tested on Polarfire riscv64
• [ ] Author has run make-checks and it passes
• [ ] All automatic Github Action checks pass - see actions
• [ ] Author has added reviewers and removed PR draft status
• [ ] Change requires full re-installation
• [x] Change can be updated with nixos-rebuild ... switch

Instructions for Testing

Test that the integrated Lenovo X1 camera works in applications launched from the business-vm. Note: A reboot is required if the system is updated using nixos-rebuild.

[milva-unikie]

Tested on Lenovo-X1 (nixos-rebuild switch)

• Integrated camera works in business-vm.
• USB camera works in chromium-vm.