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

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https://hg.mozilla.org/integration/gaia-central/rev/6c7d7c523464
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #19777 from zacc/bug_1017695

Bug 1017695 - Repair wait in Usage app FTU object for Flame compatibilit...

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https://hg.mozilla.org/integration/gaia-central/rev/886fa15b9ef5
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1017695 - Repair wait in Usage app FTU object for Flame compatibility
Bumping manifests a=b2g-bump