Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3c6aad9bbd93
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #25640 from huchengtw-moz/bug-1090806-remove-files

Bug 1090806 - [Stingray] remove useless file from smart-system, r=rexboy

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https://hg.mozilla.org/integration/gaia-central/rev/c61dc4d0ca8b
Author: John Hu <johu@mozilla.com>
Desc: Bug 1090806 - [Stingray] remove useless file from smart-system
Bumping manifests a=b2g-bump