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

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https://hg.mozilla.org/integration/gaia-central/rev/fc70d0a65a5b
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #16526 from mcav/pr-16264

Bug 922128 - [Clock] Defer Panel loading and execution. r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/fffb9f8e3922
Author: Mike Pennisi <mike@mikepennisi.com>
Desc: Bug 922128 - [Clock] Defer Panel loading and execution. r=mcav

r=mcav
Bumping manifests a=b2g-bump