Add more ram and cpu core to Audiovm

[josa41]

Description of changes

Added more ram and another cpu core for Audiovm

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
• [X] 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

• [ ] List all targets that this applies to:
• [ ] Is this a new feature
  • [ ] List the test steps to verify:
• [ ] If it is an improvement how does it impact existing functionality?

[milva-unikie]

Tested on Lenovo-X1 (nixos-rebuild switch)

• This seems to be enough memory and cpu to support the audio-vm. Audio is not stuttering anymore.
• (I did not make a comprehensive analyzes on other vm:s and their performance with this change.)