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

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https://hg.mozilla.org/integration/gaia-central/rev/fe568b851f1f
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1115602 - merge pull request #27017 from gasolin:issue-1115602 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/aebf8e281ae3
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1115602 - [callscreen][bluetooth] clean up unused mock_mozbluetooth file
Bumping manifests a=b2g-bump