[SKIP CI] sof_builder/Dockerfile: restore deleted toolchains #7552
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Building a Docker image takes several hours. To reduce costs and save time we don't want to maintain a different Docker image for the stable-v2.2 branch. Restore toolchains that were accidentally removed from the Dockerfile because this will unnecessarily paint red every PR submitted to the stable-v2.2 branch, example:
https://github.com/thesofproject/sof/actions/runs/4867162042/jobs/8679468096
If we want to stop supporting something then let's keep things simple and remove it only where it actually gets in the way and where it actually becomes a problem. No need to search and scrub every reference to it from the face of the planet and accidentally make our life harder on release branches, create pointless git conflicts and increase maintenance costs when trying to reduce them!