a15: Add FP6 manifest setup

Description

a15: Add FP6 manifest setup

Tests

• Should be able to build from release system

Issues

https://gitlab.e.foundation/e/devices/backlog/-/issues/1309

10 commandments of code review

👪 ❤️ https://gitlab.e.foundation/groups/e/-/wikis/contribute/development-processes/code-review-guidelines

Summary by CodeRabbit

• New Features

  • Added support for Fairphone FP6 device and its kernel.

• Chores

  • Updated source repositories for several Qualcomm SM8650 audio and sepolicy vendor components.
  • Removed old LineageOS projects and replaced them with versions from a new remote source.