v1.7-rc1

RC1 for v1.7

First release candidate for v1.7. Expected to have some issues and not production ready.

Issues
Issues mostly relate to Intel Tigerlake platform and fixes are being validated prior to rc2 or v1.7 final.
https://github.com/thesofproject/sof/issues?q=is%3Aopen+is%3Aissue+milestone%3Av1.7

Todo

1. Add release notes.
2. Some "fix" PRs still being refined, will merge for rc2 or v1.7 final.
3. Sign and upload.