Add 'meta-phosphor/' from commit '93fb535853a24d4c3c42ec425ac92c9d3de13294'

git-subtree-dir: meta-phosphor
git-subtree-mainline: 21f9b84b4b729fbd7acbd465e7a3f726e4d20f91
git-subtree-split: 93fb535853a24d4c3c42ec425ac92c9d3de13294